Hi well you have come to the right place to ask questions! There are experience breeders on this site. If I were you I'd definitely do like the last poster said and take her to vet NOW! She is such a tiny lil girl. I think they recomend not to breed under 5 lbs My girl just had babies on Sunday, she is 7 lbs when not pregnant I wish you all the best! Let us know how it goes.
Paula
Halle
Brutis
Baby Girls