Babies are messy though, they are just learning to eat so they dont exactly know how to eat neat. Maybe feed her yourself or have less messy food for her
Get a full cover bib I like tidy tots that suction to tray or table. Take a washable mat with bag to put underneath highchair. Job done 👍🏽
A good bib, take pouches and a holder with you and try to clean as she eats. Ask for lots of extra napkins. Limit the food she has access to. 1 bite at a time is way easier to keep tidy. Give her a bite then wipe her face and hands repeat until she is full.
Bibado.
Maybe get less messy foods? if you have things like potato wedges and pieces of chicken? Maybe put a towel or something down on her lap in front of her? that way you can just pick it up and dump it/having an easier cleanup when she’s done