what should I text this girl from work to keep a conversation going?

Current Events

So a week or so back, this girl from work owed me money for food and she was like "omg I still have to pay you back lol".

So she Zelles me later at like 12am, no message. So I just text her "about time " and that turns into a 2 hour text conversation from there.

We got food again at work and she owes me money again. I joked that I should just start a tab for her. She pays me back all the time so I know she's good for it.

I dont want to reuse the same line again on text so what should I say this time to start a conversation again?