Some info found on utcourts.gov that may pertain to her journal, and hearsay:
Rule 106. Remainder of or related writings or recorded statements.
When a writing or recorded statement or part thereof is introduced by a party, an adverse party may require the introduction at that time of any other part or any other writing or recorded statement which ought in fairness to be considered contemporaneously with it.
ADVISORY COMMITTEE NOTE
This rule is the federal rule, verbatim. Utah Rules of Evidence (1971) was not as specific, but Rule 106 is otherwise in accord with Utah practice.
Rule 401. Definition of "relevant evidence."
"Relevant evidence" means evidence having any tendency to make the existence of any fact that is of consequence to the determination of the action more probable or less probable than it would be without the evidence.
ADVISORY COMMITTEE NOTE
This rule is the federal rule, verbatim, and is comparable in substance to Rule 1(2), Utah Rules of Evidence (1971), but the former rule defined relevant evidence as that having a tendency to prove or disprove the existence of any "material fact." Avoiding the use of the term "material fact" accords with the application given to former Rule 1(2) by the Utah Supreme Court. State v. Peterson, 560 P.2d 1387 (Utah 1977).
Rule 612. Writing used to refresh memory.
If a witness uses a writing to refresh the witness' memory for the purpose of testifying, either
(1) while testifying, or
(2) before testifying, if the court in its discretion determines it is necessary in the interests of justice,
an adverse party is entitled to have the writing produced at the hearing, to inspect it, to cross-examine the witness thereon, and to introduce in evidence those portions which relate to the testimony of the witness. If it is claimed that the writing contains matters not related to the subject matter of the testimony the court shall examine the writing in camera, excise any portions not so related, and order delivery of the remainder to the party entitled thereto. Any portion withheld over objections shall be preserved and made available to the appellate court in the event of an appeal. If a writing is not produced or delivered pursuant to order under this rule, the court shall make any order justice requires, except that in criminal cases when the prosecution elects not to comply, the order shall be one striking the testimony or, if the court in its discretion determines that the interests of justice so require, declaring a mistrial.
ADVISORY COMMITTEE NOTE
This rule generally comports with current Utah practice.
Rule 802. Hearsay rule.
Hearsay is not admissible except as provided by law or by these rules.
ADVISORY COMMITTEE NOTE
This rule is Rule 802 of the Uniform Rules of Evidence (1974), and is the same as the first paragraph of Rule 63, Utah Rules of Evidence (1971).
(edited for purposes of brevity)
Rule 803. Hearsay exceptions; availability of declarant immaterial.
The following are not excluded by the hearsay rule, even though the declarant is available as a witness:
(3) Then existing mental, emotional, or physical condition. A statement of the declarant's then existing state of mind, emotion, sensation, or physical condition (such as intent, plan, motive, design, mental feeling, pain, and bodily health), but not including a statement of memory or belief to prove the fact remembered or believed unless it relates to the execution, revocation, identification, or terms of declarant's will.
(5) Recorded recollection. A memorandum or record concerning a matter about which a witness once had knowledge but now has insufficient recollection to enable the witness to testify fully and accurately, shown to have been made or adopted by the witness when the matter was fresh in the witness' memory and to reflect that knowledge correctly. If admitted, the memorandum or record may be read into evidence but may not itself be received as an exhibit unless offered by an adverse party.
(6) Records of regularly conducted activity. A memorandum, report, record, or data compilation, in any form, of acts, events, conditions, opinions or diagnoses, made at or near the time by, or from information transmitted by, a person with knowledge, if kept in the course of a regularly conducted business activity, and if it was the regular practice of that business activity to make the memorandum, report, record, or data compilation, all as shown by the testimony of the custodian or other qualified witness, or by certification that complies with Rule 902(11), Rule 902(12), or a statute permitting certification, unless the source of information or the method or circumstances of preparation indicate lack of trustworthiness. The term "business" as used in this paragraph includes business, institution, association, profession, occupation, and calling of every kind, whether or not conducted for profit.