Depending on the size and age of your snake, there are a few things you should and shouldn't do.

A baby snake can not go very long without food. An adult snake on the other hand can go months and months. So while "tough love" can work for adults, it isn't always the best course of action for a baby.

If your snake is on the bigger side than tough love might work. Sometimes the adults will go on random fasts and will usually pick up eating in a month or two. If your snake isn't loosing weight then I wouldn't worry about it much.

Have you tried feeding her a f/t after the live feeding? The live feeding might have been enough to get her back on feed.

As for feeding multiples. Put one mouse in, wait until it is all the way down and the snake is moving about, and then drop the second in.