How to know if she’s just leading me on

I’m recently out and have been on three dates with this girl. When we’re together we have a great time, but ever since we started talking she’s been terrible at texting. She never starts the conversations, but is into them and sends long messages when we have them. When we last met up she said she’d plan something for the next one but it’s been over 2 weeks and she’s not suggested anything. She did invite me away for the weekend, which I accepted, but the next day cancelled due to last minute need to work (she’s emergency services, so is likely). Since then she’s not made any attempt to text me or make other plans. I can’t help but think this means she’s just not that interested. Anyone got any advice?