I'm really sorry, hon. I know how insanely stressful it is trying to take care of a beloved pet that's clearly in trouble.

She needs you to keep a level head now though. Gather as much information as you can. That's your best hope of helping her.
And make a shopping list for tomorrow!
And I know you said you really can't, so I don't want to push the issue, but there's no way you could bring her inside the house so you can keep an eye on her more easily? Do you have a bathroom that you could put her in? Maybe fill the tub with towels so she has a soft place to sit? Get some water into her. If she's gushing that ooze out it's
probably dehydrating her.