Ultimately, she needs to be happy.
Although it depends on what kind of riding you do and I haven't ridden a blast, 34hp is weak. Around town it's probably OK, but on the highway......
My KLR has more hp and is slightly lighter and I think it's weak too, but around town and on the gravel, it's OK.
My wife started with an EX500 (Ninja 500) which was a great beginner bike with 59hp and 373lbs dry it has good performance and is an easy bike to ride. I don't need to tell you guys that these things are Ninja's in name only - they are definitely a beginner's bike. The 650 Ninja would also be a good choice with the same fairly upright riding position and better styling, but the 500 is probably the best bargain out there.
If I would have purchased the Ninja 650, my wife would probably still be riding it, but as fate would have it she wanted a ZX6R after taking the superbike course in Vegas. She isn't the typical woman rider, though and is very experienced racing offroad bikes.
2008 Versys, 2008 ZX6R, 2006 EX500, 2002 KLR650
2010 KTM 300XCW, 2007 KTM 200XC, 2006 KTM 200 XC,
2004 CRF250X, 2002 CRF150