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"She tends to be, for some reason, very loyal to her husband and even told me that she wants to have his babies. "
The reason is that she is happily married.
All that's here for you is the inspiring experience of meeting the kind of woman you would like to be with. I am buoyed when I meet someone I could fall in love with - it's nice to know you're capable of these feelings and it's nice to know possibilities are out there.
I think you should admire and adore her for what she is, a gorgeous happily married colleague. She's going out for drinks with you because even beautiful happily married women like to go for drinks with friends. Amazing but true.