Feeding my baby

Okay ladies my baby is almost 6 months now, since she was almost 5 months I started giving her solids. (1st stage Gerber solids) and she loves it the only problem is my mom... every time we go out to eat or we are with her, she wants to give everything to my baby. Like mayonnaise, ketchup, sweet tea, jelly, syrup (because she is eating a waffle), beef meat to just suck it and play with it.. I'm tired of telling her no because that's not healthy at all and she is too little...

What are other ways to stop her and so she can understand ??