We were given a script for pain stop by our GP for teething at 14 months after cycling panadol and nurofen was failing to give him any relief and he'd screamed himself hoarse from the pain. It certainly has it's uses but I wouldn't want to use it long term or without consulting a doctor first.

The other thing she'd need to watch is codeine can cause constipation. She'd need to make sure bub is drinking a lot and if eating solids (dicey with really problematic teeth I know) having plenty of fibre.