She looks like she could be part Shepherd. Here is what my puppy looked like at 7 weeks.
His mom is a full shepherd, but because I got him from rescue we are not sure what daddy is.
Shepherd tummies are sensitive and if you suddenly switched her to a different food from what she was eating that could cause problems. She looks to big for milk re-placer. Hopefully others will chime in with suggestions but the only thing I can think of is maybe a quality canned mixed in with kibble.