Live Hand: Stumped

Blinds 100/200
Buyin $5
3 handed
Payout: 1st is $20, 2nd is $5

Button about t2500
SB about t1000
BB (hero) about t1500

Hero: J5o

Button calls.
SB completes.
Hero check.

Flop: QT5 (rainbow)

SB: check
Hero: check
BB: check

Turn: 3rainbow

SB: check
Hero: t400
Button: push
SB: fold
Hero????

Read: Button is LAG but crafty. Also, she is 8 years old and looking to pwn her own father. Thoughts? Results later.