If she's hypothyroid then it means her thyroid gland isn't able to produce the amount of T4/T3 her body needs for optimal metabolism. This is why her vision is blurry, she's tired all of the time, can't lose weight, can't think straight, etc.
She can confirm this with a $39 thyroid panel from here
http://www.saveonlabs.com/products/T...-with-TSH.html (order, walk into local lab with paperwork, receive results online).
If her TSH is high or over the top of the range, then she's got a thyroid condition.
Next, order some "dessicated" thyroid medication, like Armour, Nature Thyroid, Thyroid-S, etc. online. It's cheap. You can get a 6 month supply for like 50 bucks.
Start with 1 pill in the AM. Then after 2 weeks, increase to 1 pill AM and half a pill in the afternoon. She should be paying attention to how she feels and look to adjust her dose upwards until she feels good and wants to stay where she's at OR she begins feeling hyperthyroid symptoms (rapid heartbeat, anxiousness). If she gets to 2 pills, then hold for 6 weeks before deciding whether to increase or not.
There you go, medical advise on GFY
I treat my own thyroid btw. Quack docs have their treatments all fucked up.