Hello,
My cat named Calli is vomiting white foam. She is 7 yrs old and weighs 10 lbs. I feed her normally one-third of a cup of food twice a day but she has not really eated the first cup prior to the reload of the food at night. I noticed she recently has an issue with vomiting white foam and I am not sure what is causing the issue.

I hope I can get her better soon.

Bill

It is difficult to give you much insight on the internet, these are pretty vague symptoms.
Your vet is your best source for what may be going on with her, lots of cats vomit occasionally, but if this is new or abnormal for her and her appetite is decreased then it is time for a check-up.