Good Evening, I Have An 8 Week Old Puppy That

good evening, i have an 8 week old puppy that my husband gave a can of milk and also half soft dog puppy food. duchess is 5 pounds and had her vaccine on wednesday. i have put her on puppy kibble but has been having very soft stools for the last 2 days. i started mixing with a little pasta mashed up and would like to know if i can give her probiotics and how much... she is playful and drinks alot of water but pooing like maybe 6 times and im worried. plse advise what is the fastest safest remidy for her. thank you