How to reply

Hey guys. Need some help with this situation i have. Its in Slovene so i will just translate it for you.

Some back story:
I matched with her on Tinder last weekend and asked out, to which she agreed but because of her work schedule we said we will go out next weekend. I asked her for her instagram and then didnt text her intill today.

I send her a hey girl happy tuesday meme
her: hey, same to you 😀
me: How is your day going
her: I worked all day. Just got home. Wby?
me: great! Just finished a nice workout, looking nice and fit for our date
her: thats great, i wont be fit for our date 😂

How should i reply to this?
I checked her IG and she doesnt look fat. was it just a joke or am i getting catfished?

Thanks