If she's down to chill, she's down to chill. Just don't put any extra stock into it. If you have plans (other chicks, friends, a hobby, etc) or a different option, don't push her to the top of the list. It's probably a chin check and from what it sounds like, as soon as she knows she can get you to change plans (see: wrapped around her finger) there's a chance she'll cancel or go MIA again.
I've been there with a man-eater. They let you get it in deep as they need to (including fvcking, etc.) to get your ego inflated and then they change soon as they got you wrapped around their finger. The only thing you can do is not get wrapped around their finger in the first place. Once they got you wrapped, the notch on their belt is there. They never see you the same again. That doesn't meant that they won't let you fvck again, but your not the same challenge to them. The only way to reverse course is to convince them they never had you wrapped around their finger, and I have no clue how to do that. It's the way of the man-eater, that's her point. Once you're eaten, its mission accomplished to them. Shots with the girlfriends and on to the next conquest.
Basic Samson and Delilah. Once you're ponytail is cut, you gotta grow it back and move on to kill everything else going forward. Samson knew what Delilah was after when she kept trying to trap him and asking him what the source of his strength was, so he just basically charged it to the game when he got caught slipping. After he grew his hair back, he concerned himself with current issues and not with Delilah.
If you run into one of these in the future, recognize it asap, get what you want, and then "break-up" with them as soon as she starts acting up. That's a loss to her and you're still a challenge. She will try again, you will keep fvcking, and she will be wrapped around your finger as the man that's unconquerable. The chicks games will change, but be true to yourself and dump her when you're not feelin how she's been actin. Don't have a discussion about it or give her a warning, just take action. When she shows changes through action or shows begging through action (e.g. she calls you and comes over to talk/apologize, which really just ends up being her giving you a great blow job and swallowing every drop and/or her unsolicited putting your load on her face) then let her know you'll give her another chance (if you want to) but she's on a short leash, and she better keep you happy. Also know this through experience.
Basically, when it comes to man-eaters, you can never show any signs of weakness, and have to always maintain the upper hand. IMHO, they're not long term material, but they are some of the best sexual experiences as my first facial, 2nd anal, and all of my blow job queens have been man-eaters. The longest I've held one down has been 7 months in college. I still have the videos, lol.