Unfortunately, $200 indoor exercise machines are generally of poor quality. I understand that money is tight but here is one option for about the same money as new low-end elliptical trainers. Find her an older used steel frame MTB that is in decent riding condition. Around here they go for around $100 - $150.
I rode this one for a summer before selling it. I bought it for $75 as shown.
You can get a new indoor trainer that will allow her to use that bike as a stationary bike for under $200.
http://www.rei.com/product/863022/cy...copy:s_kwcid**
For under $300 you will have an indoor trainer far superior to most stationary exercise bikes in that price range, with the added advantage that it uses easily obtainable standardized parts and the bike can be used for outdoor riding whenever she chooses.