I would assume that she meant that she wanted to stay in touch with you, especially since SHE asked you for your e-mail address. But since you know that she's in a relationship, that "staying in touch" could really just be friendly. E-mail her a couple weeks after you guys exchanged e-mails and see where she's going with this.
To me it means- "What's your email in case things with my current man don't pan out?"
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