Is it OK to offer to be a surrogate? UPDATE

My SIL has been unsuccessfully TTC since a miscarriage two years ago. She is talking about giving up soon and considering adoption. She has never mentioned surrogacy, I honestly don’t think it has ever crossed her mind. She has tried just about every fertility option available. I would absolutely without a doubt carry a child for her. Is it ok for me to bring this up and ask her? Is this something that would be offensive to someone who believes they can’t get pregnant?

**Update**

We were in a discussion about TTC and I was able to bring up surrogacy and then let her know that I would be that option for her. She was moved by my intentions and wants to try for a couple more months, and if unsuccessful should would like to discuss the surrogacy option with her OB. Thank you all for your inputs and support on this! I will update if she gets a BFP or if she decides to go the surrogacy route.