I have a sick puppy who needs help?

i have a puppy almost 4 months german shepard lab mix shes been perfectly healthy till yesterday she didnt eat all day yesterday and today she will drink water but shes not her playfull self as normal. she has gotten sick a few times and had diarriea 3 times we just gave her first dose of dewormer a week ago and she likes to eat anything she finds on the ground so were not sure whats wrong. all she wants to do is sleep. if anyone knows of someone that can help her or tell us whats wrong id greatly appreciate it.