I demote women similar to this. Depending on how they respond to me. If she doesn't respond favorable you remove your attention, unfriend/ unfollow. Be more cold and distant. If she continues she loses me entirely. Women will either want to make an effort or they won't. You have to treat them accordingly.Clearly it wasn't a good time for her, otherwise she'd be bouncing on your lap.
In the future if a woman gives you an excuse without a counteroffer, never ask again. If a woman wants to see you she'll make it very easy, she'll say something like "oh shoot *insert excuse*, I'm so sorry I promise this won't happen again! How about Monday at 5pm? I can meet you at x,y,z."
Any form of breadcrumbs is most likely an attempt to exploit the validation you've so easily provided in the past. Insecure women are strange, they'll use breadcrumbs under the guise of not wanting to hurt your feelings. It doesn't sound like she's tried to call or catch you somewhere in person, and it sounds like her texts are all fluff/crumbs and no apologies or counteroffers.
If she's made excuses for multiple offers then you've already shown you're a bit desperate and lack some self respect. The best thing to do is go out and have fun with other women, as you've stated you'll do. She'll either make up for her mistakes by going out of her way (unlikely), or you'll meet a woman that would love to hang out with you, win win.
You probably shouldn't try the below, but I'm mentioning it here for everyone's benefit.
A more sophisticated approach is to learn to demote women to the friendzone. It's a great counter to breadcrumbs or disrespect. And if she doesn't seem like good friend material then simply place your attention on other people and demote her further. If I was in your place; if she asks me out I'd say I'm not interested in going beyond my front door. If she says something I find funny I'd just send a lol. She's demoted, so she no longer has a chance with me. I'll rarely respond with a question, unless it's a polite gesture that I would show any acquaintance or stranger. Otherwise I will put zero effort into a conversation. She'll either have to make up for her mistakes, or she'll never see me again (except randomly when I'm out). This comes from a place of effortless and care-free self respect, not out of anger or spite.
On the other hand you do need come from a place of having fun with it. Not spiteful and buthurt.