Update on the rescue:
Most likely a no-go. I’ve texted her multiple times, contacted her husband to let her know I left some important messages, and no direct response from her. Instead, she posted in our team member group basically saying “If you’ve been trying to contact me, I am buried head to toe trying to get things done and you aren’t the only one needing me to do things for you, but I’m trying my best to get to everyone. Please understand.” In my text, I explained my situation, left the suggestion of fostering my own horse, and said that if she couldn’t do that in time, perhaps she can give me alternative people or organizations to contact.
She then posted an update on the farm. We are preparing (preparing pastures for winter mud, building stalls, replacing fencing) to move the most recent rescue horses out of the quarantine pasture to make room for new rescue horses coming soon.
I will take this as a no, there isn’t anything she can do for my mare for a while. A rescue is hard work and priorities are kept straight, and I respect that. I don’t if she’d be able to take in my mare with 1-3 more rescues, but I won’t bet on it. I will continue to do my research and get in touch with as many organizations, different vets (get quotes and discuss my situation), farms, trusted people, to see what else I can do for my girl. I can’t believe how quickly September had passed. In the meantime, I’m still saving whatever money I can and keeping her as happy as can be 
I hope to keep this thread updated for everyone eventually.
Also a random note, I recently have been assigned an assignment to create a personal essay (we are working on resumes and college applications, some larger universities require a personal essay upon applying to evaluate something else besides your grades). Many of the prompts given for the essay have to do with something that has affected you, whether it’s an event or an obstacle, and I believe that this situation is perfect to write about. It’s something personal and something I’m passionate about. It’s not pretty, it’s not all that happy, but it’s surely something I’ve learned from. Sacrifices will be made with tough decisions for the better, and it has changed the way I perceive commitments, risks, consequences, and has helped me grow in more than one way.