I too thought perhaps a UTI, however, Jess who is 2.4 her wee smells weird atm too and I think she is teething (back molars) and thats why it stinks. She drinks a truck load of water, so its not that.

If Hailey's not getting molars then perhaps get off to the doc to get a urine analysis for UTI.

Good luck,
Rachael.