I would put down some shavings or pine pellets for stalls so it could soak up moisture and keep that filled up and help dry out her stall. It sounds like you are going to have a problem until the melt is gone. Maybe shavings on the bottom to act like a sponge and then straw on top ??
If her feet are spongy and she is starting to get an abcess, I would pack the hoof with antiphilogestine or any drawing type clay type poultice and wrap her foot , with cotton and vet wrap and then use a lot of duct tape to make a final exterior wrap or boot.