Is she flirting with me or friendly?

We work in different offices but whenever I walk into her office, she finds ways to initiate small talk with me. Whenever someone else talks to me in her presence, she`d say something. We lock into each other`s eyes very often.

At lunch break, she comments on my food, asks me questions, and only talks to despite the presence of other employees of both sexes. I have also noticed that she doesn;t act the same to other employees.

She has been in a Relationship for eight years and I once made a joke telling that they will make babies.. etc.
She said she wasn't ready for kids and she wants to travel instead.
Iam confused.
Is she flirting with me or friendly?
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