My married friend wants me to visit her and stay at her house?

So I have a friend who moved away. I don’t see her as often as I used to naturally but One day she calls me up and told me that she wanted me to visit her and that I can come down and stay at her house whenever I wanted to get away. She claims her husband wouldn’t care. Keep in mind I’ve never met her husband and these are her words not his Me and her had gotten pretty close during our time working but we never hung out and most of our conversations and interactions took place at the job. Even when she got divorced from her 2nd marriage we never hung out. So the sudden invitation really caught me off guard. I’m flattered that she trust me to be in her personal space but to me that’s a big jump from just talking at the job to spending the night at her house. I feel like it’s an awkward situation for me and her husband because our first time meeting would be me staying in his house. Being transparent I’m am attracted to her but what keeps me in check is that I am a firm believer of getting back what you put out. I’m just wondering what she is thinking. I’m curious to hear your opinions

Updates
8 mo
I should have mentioned there is a 15 year age gap between us so she might just see me as a little brother I’m 30 and she is 45
My married friend wants me to visit her and stay at her house?
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