Maybe they don't want to play games. Why is it every guy always tries to get their other half into games and always spew out the same tired old ways to get them into games as if they really do love games but need some magic key to unlock that desire. My wife likes plenty of stuff I don't and vice versa.
Gamer dudes are awful at this. When the hell was the last time someone really tried to get their girl into wood working, or welding, or say I really need to support her into getting into stamp collecting.
Just because you love games doesn't mean she has to also. And you don't need to try and push her either. Just be glad she is with you. Offer to let her play, she says no then let it go.