Her ex claims that Teleka has psychiatric problems. The relevation that she was stalking the gospel singer seems to confirm this. On the other hand, it would have been extremely hard to get through medical school while having a serious mental illness. So I think that she may not be schizophrenic. My guess is, although of course this is pure speculation - diagnosis with so little knowledge is impossible, that she suffers from a borderline personality disorder. People with BPD may seem act normal for most people, but their behavior is odd to people in close relationships. People with BPD may completely adore their love interest and then suddenly change to hostility. They have a deep-seated fear of abandonment. People with BPD are more likely to stalk. They also have impulsive behaviour, such as reckless driving, suicide attempts/self mutilation, eating disorders, agitation. (I don't know if Teleka has/had an eating disorder, but there is a significant weight loss if you compare earlier photo's with more recent ones). At moments of distress, people with BPD may experience hallucinations.
I presume some of the videos she posted were meant for Sapp, the gospel singer. She refers to song-writing. And whomever she was making the video for, does not seem to replicate her "love". With the restraining order, she would not have been allowed to send emails/text messages to Sapp. Posting the videos (without addressing the love interest ever by name) may have been a way to circumvent the restraining order. Although it is not clear how she could make Sapp watch the videos. He probably never saw them.
Then again, there could be another love interest that we do not know of. But I think she would not have been able to let go of her stalking target that easily.
Anyway, I am not sure how a mental disorder fits into the picture. I think there still may be some (twisted) logic to her actions on the day she disappeared.