10 days into flower, you've got 10 more of stretch to go. Whats the watering frequency? 3-4 days?? if so you'll be ok to take her through flower in that pot. If its more frequent, a transplant may help. the only down side tho is the risk of shock to the plant from the transplant. If she goes in shock it could take 1-6 days for her to recover, and then she'll be in bud development instead of stretch.