hello everyone im new to forum, have a question about what bike to buy for my daughter she currently has a crf70 which is no longer sufficient for her, she weighs about 55 pounds and is 4 foot 3 inches tall, we ride mainly on fire roads and two track trails last year about 500 miles she also plays around in the local sand pits, the 70 is just pinned all the time with her on it, a crf150 is to heavy for her to manage weight wise right now. a cr85 is perfect for her, she rides around on a friends but worried about trail riddin it, any suggestion would be greatly appreciated.