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The soft
loose stool may indicate that she may have
diarrhea.
This is most usually due to viral or bacterial infection.
Fluid management, to prevent
dehydration, if one of the most important aspects of treatment.
Oral rehydration fluids such as
pedialyte , should be used to give back fluid and electolytes ( salts she would be losing).
When there is a 4 hour window with no diarrhea, solid food should be restarted with small amounts of dry food initially.
Probiotics either on their own or in yogurt would help with resolution.
After the infection has resolved, you can consider asking your doctor for a referral to a nutritionist to help with weight.
I hope this helps