S.E.
Our daughter would stop eating when she had a stomach bug, early stages before symptoms appear. In fact, she still does this. When she asks for soup, we know she is fighting a bug. Might be a smart baby.
Do you feed her the baby food? If so, maybe she just wants to be fed.
As already mentioned teething can impact appetite. That never really happened for my daughter. She loved to chew on her gums as teeth were coming in. She's even put her daddy's finger in her mouth and get him to rub them for her.
S