Spit up - how much is too much?

My LO is on solids now and loves her food. But she still spits up a ton. I feel like it is more than it should be and sometimes up to 2-3 hours after she's eaten it's still coming (and frequently a mix between formula and whatever she's eaten ex. Broccoli). Some times it can be quite a lot and smell like vomit. Our pediatrician didn't seem to be concerned before but I was expecting things to change a bit when she went on solids.

She's 6.5 months and currently on Gerber soothe formula - should I consider changing it? Is it something I should go back and talk to the doctor about? She has to go in for a shot in 2 weeks can it wait? I have no idea what to do. Help please!