Spending some time in a warm basement would be ok.... the idea is that the warmth from the bath will help relax her making the egg easier to pass. Tums are antacids.... people take them for acid reflux and like I said, I’m not sure if the exact reason but I’ve read people using them to help with...
Put her in a warm bath with some epsom salt and let her relax... see if it doesn’t come out. Of course, you will have to thoroughly dry her before letting her back outside. I have also heard of people giving their birds crushed tums for this kind of thing, but this is not my specialty...