A girl and I have been texting and we’re collaborating on a project together (creative endeavors)

She has specifically said “I would honestly love to meet up and just hang out or something...”

And I respond asking her if after our busy project is over, if I could cook her dinner?

She said “Yes I’d love to hang out!”

Ideas on how to lock this in as an actual date? She might be unsure as to what I mean by what I said.