How to find her?

local phone book?

Have you tried looking up her immediate family? I don't know how old you are, but if she's never owned a residence you're more likely to find her parents/guardians under whitepages, especially if you have an idea of what state/region she might be in. Slblings could show up for something to do with school.

Even if you don't know her parents' full names, something like last name + occupation (if you know what they did) could turn up a professional page.

Try other search engines to see what you get. Since you know her approximate age, add that, her birth date, the state/region you knew her in, anything else you can guess in various combos -- even age + first name + state might end up finding her in some newspaper. If her name has any sort of common shortening or nickname, look for her under that also.

Ty for answering im gonna check her parents, good idea ;)