I can't imagine it was cold enough to become hypothermic. The lows this time of year for that county are mid-70's.
http://forecast.weather.gov/MapClick.php?zoneid=ALZ046
Also someone mentioned above about her limited vision. I imagine without vision correction her eyesight is quite poor, but with her contacts I assume she sees fairly well. Why wouldn't she have her contacts in while lost in the woods? Although not wise, lots of people wear their contacts for far longer than recommended because they still work. In her situation I'd do everything possible to keep my contacts in.
It's just odd that they are mentioning her blindness now but it wasn't part of the story when she went missing. I feel like that is an important thing to mention and would have been covered at the same time the family said she had a medical condition.
Do you wear contacts regularly? I assume not because sleeping in contacts is legit terrible. My eyes are dry and tired by the end of the work day; I can't imagine wearing contacts for weeks straight. They probably would have fallen out due to dryness after a few days. Also - I will wear a set of contacts for way longer than they are supposed to be worn, as long as they are in good shape. However that's with me soaking them every night. Keeping them latched to your eyes 24/7 is totally different.
That being said I also find it strange they never mentioned her blindness until now.