Inviting a woman over to your place for a cup of coffee?

Ok….here is my question

I invited my former co-worker (a female) to my place for coffee and some bakery goodies, tomorrow. Im working on my social skills, my plan is inviting couple of people ,who I was in touch with and got along with but haven’t been in touch with lately, over to my place for some coffee and some chit chat.

So she accepted the invation, but 10 min. after that, she send me that she was curious about this “coffee meeting”....I asked her, what she means…and she said nothing and she looks forward to seeing me tomorrow.

So basically my question is this…when you invite a girl to your place for coffee, is it usually implied that sex is involved? hahaha because that is honestly not my agenda and I felt she thought I was inviting her over for sex.

Maybe next time I invite people to meet me at a coffee place instead of my house.