You should really call the place. This is an informal Q&A between customers and not something the restaurant views.
If they don't take reservations, there's a area inside with chairs for those waiting. I'm sure if you ask someone will give up their seat for her. Nice ppl offered me a seat when I was pregnant.
They dont typically take reservations to my knowledge and Sunday is their busiest day. I would call and ask for the manager. He may make an accommodation for you if possible.
Sunday's are the busiest day so a reservation may not happen
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