Hi there..
It never hurts to contact hospital or clinic if you have concerns.. go with your instincts.. but swelling is not a symptom of baclofen withdrawl.

Sometimes baclofen can have the oposite reaction and create spasticity that is possibly what they are checking for, there are other drugs that help with this symptom but I don't have first hand experience with them.

As for the swelling I'd get her legs higher than her heart.. a couch cushion helps.. prop her legs on that and keep them up as much as possible through this stage.. the swelling gets better but takes it's time.. the more up they are the less swelling I find.

Soft healing hugs to both of you,
Sandra