Is she interested or not?

Ok I had plans with this girl I met online to go mini golfing and then go to my house to watch a movie. We went mini golfing, and things seemed to go well. We had a lot in common and I had her laughing the whole time. When we went to our cars she told me that she could not come over because she had “work” tomorrow morning but said she’d want to go on another date.

Is this a bad sign? Was she just being nice?? Why would she do this?