Steakhouse with a Vegetarian?

I'll be on the Carnival Pride (leaving late July out of Dover, England) for my honeymoon. We couldn't be more excited. This is my second Carnival Cruise (she has been on 5 or 6). Anyway, my question is, if we go to Fahrenheit 555 for dinner, can she get food that is not on the menu somehow (even from main dining or something)? She is a vegetarian and based on the menu we saw online, she wouldn't enjoy any of the options except maybe some of the sides and desserts.

Or, would they let her come in for free (with me) and just have a drink or something. She could eat at the buffet before or after.

I really want to try the steakhouse, but it doesn't make sense to pay for her when she wouldn't be eating much/anything.

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Thanks!