Portable “highchair” for restaurants?

Yes I posted this before but I posted it in a gigantic paragraph of other questions. So I wanted to specifically make a post for just this question. My daughter is six years old and because of her dwarfism she is 1‘5“ tall and 18. When we go out to restaurants, and Clara sit at the table or booth, she isn’t able to see you over the table, and even with the provided boosters at the restaurant, she is barely able to see over the edge of the table..What should we do about this when we go to restaurants?. I would love to get her all the way up to be able to eat comfortably and be a part of the conversation, not just under the table.

It would be nice if Clara could climb in and out of this herself. I made another post asking about eating at home, but the difference here is that what we use would need to be adjustable given that it would be used at restaurants and there are different height tables. The high chairs that they have at restaurants do sort of work, but Clara is not a baby, she is 6.