I wanted to call the waitress sweetheart in a non-affectionate way

Question

So we went to dinner, at a small hole in the wall dive that I like. The food is mediocre but the atmosphere is tops. Our waitress was friendly, and being that we are in Texas, we call people we don't know well sweetheart and honey and darling.

How you doing tonight sweetheart? Very common. So I wanted to call her sweetheart so I used mija. My mom was with me so we thought about how you would say sweetheart in a non affectionate way and both thought mija was best, better than querida and cariño. What do you guys think? Gracias.