HELP! I just woke up this morning to find my mother mouse of a litter of thirteen dead! she had plenty of food and water, but I guess 13 babies were too many for her..

What do I do? I called a petstore and they said that is highly unlikely that i can hand-nurse them and that they probably wont make it..

Not to be insensitive, but should I feed them now? give them to a petstore to freeze? I dont want them to suffer and die