First stop everything that you are using... You need to know what is bothering her and if you have too many potentials things upsetting her body you wont know how to eliminate the problem...
I would fast her for about 12 hours because she is young and then give her some boiled hamburg and rice... I used to use 1 lb hamburg and one bag of rice (boil in bag kind)
Give portions the mixture over the course of the rest of the day and she how she does from there...
If she returns to normal, intoduce gradually new food...If not, continue on hambuger and rice for another day. If pup still doesnt recover bring a stool sample to the vet to make sure your pup didnt pick something up.
If she becomes lathergic, uninterested, not drinking etc... call the vet and tell them that she is just losing interest in everything
What shots did she have... sometimes shots can send their system into a panic... I know worming and rabies can cause loose stool etc...
just dont do too much too soonÂ