E got her first pair over the weekend and she loves them, but after a few days of wearing them she has blisters

On her baby toes and on the side of the foot where the little circle for the strap is. Her feet also get SOAKING wet with sweat in them. Is this a normal "breaking in" for crocs or are they just not right for her feet?
Re: blisters from crocs?
if the little toe has blisters maybe they are too small for her?
Both my girls wear them and don't get blisters or sweaty feet either.