I don't have any personal experience with this type of behavior, but here's some ideas.
Have you had her since she was a pup?
How do you react when something happens (loud noise or approaching the elevator)? Do you baby talk "it's ok," or try to reassure her? Sometimes that just reinforces her reactions and teaches her to react that way. If you're calm and confident, she'll pick up on that and may become calmer. If you're nervous or anxious, she'll be also.
Perhaps you can try giving her treats and praises when approaching the elevator. Make it a positive experience.
Or, alternatively, make it a non-issue. Don't make a big deal out of it. Calmly get on the elevator and completely ignore her. Praise her when you get off and she hasn't urinated.
Get her out in more situations and "desensitize" her to noises and scary things.
Good luck!
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Linda
Remy -DOB 6/2/92; white male w/brindle patches;
Bailey - DOB 10/16/99; flashy brindle female
Shannon - 1992?-12/7/99 Flashy fawn; We miss her!