If she can have her ride both and see what she likes better. I have rode many 137 with no pushing issues. My 15 year old daughter rode my buddies 2016 gade 1200 and she had no issues rideing quick through the corners.
So I was faced with the same dilemma. Bought a new sled and was thinking a Blizzard for the shorter track for turning but she really liked the enduro. I ended up getting the enduro and I feel it was the right way to go. Ultimately she is not going to turn as aggressive as I do so really it's about her being more comfortable riding and the 137 (and air ride suspension of the enduro) gives her that. So ultimately I feel like you should go with what's more important a plush ride or better cornering.
My wife came off a 129 cat, and now on a 16' gade. She loves it. no complaints of pushing. And I feel the same way. There is also another girl we ride with that bought a new 16' 129 X package. And regrets not getting another 137. I prefer the gade over my 129 cats. But I cant really speak for the 129 Doo. But I can tell you neither of my gades push at all. Very, very happy with the ride and handling.
I went from a 121"; which I still have, to a 137". I have never ridden a 129". The push in trails is there, but I don't feel it's drastic at all. In your case, I'd choose the 137"- the ride over bumps will be better, better in deeper snow, and the corner push isn't as bad as some will have you think.
I went from an 05 cat f7sp 128 to a 14 gade 800 137. Go with the 137 in my opinion. I love mine. No pushing in corners at all. Rode with no studs without pushing but did t like the no traction. Installed studs and 8in main carbides wifh the 4in outers and itbrides awesome. Literally can lut 300 miles on it and my back feels better after the ride then befor I got on the sled. Makes me want to ride it another 300miles right away.
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