Hey Growmie,
She will actually begin to stretch since she is in flower, now how much she'll stretch will depend on her genetics and the damage from the stress that was caused. As far as yield, this will affect it I can't really say what it will be but don't expect a lot, maybe 10-12 grams at max. Hopefully, this was helpful, and remember ... "Happy Growing" and "Free your mind one puff at a time".