Thank you so much, your understanding and kindness mean so much to me!!
She is at least mid to upper 20s, so yes even if I was a world renown vet, she could still go tonight and there would be nothing I could do to stop it. Her being able to use the ‘potty’ was the one thing keeping me hoping for the best last night. I would see her poop and then go ok…I want to see her go one more time…one more time…next thing I knew it was 1am n I was debating sleeping in the barn on the hay bales since it was pouring rain. Then I had to pee!!! 
Her breathing and heart rate are the 2 things still doing on from last night and I just worry about her heart being able to keep supporting her body and being strong enough. She still is not laying down much, she’s old and has that back yonder good ole boys rode hard n turned back out wet until it was time to have a saddle tossed on again look to her. No fat or muscle to help support her organs, no nutrition to help feed and heal them, only worms stealing what little she was trying to eat until now. If it is her heart, there’s nothing to be done at her age that I would put her thru. The vet said she has a very pronounced jugular, I watched it pump blood thru with every pulse beat I counted last night.
She did get her teeth floated last Monday. With barely 1cc of ace for the metal speculum. Whether that is because shes just that dang docile, or because she is that dang weak and did not have the fight in her I cannot say. So besides that one loose tooth her other teeth are as good as they can be. Any piece of hay or anything could have caused an issue but again, the heart rate n breathing are still higher than normal even now
Vet said her lungs sound completely clear, no wheeze, no whistle, no sounds of congestion or fluid build up. No temp this whole time, no cough either. (I am wondering where she puts her whole face and nostrils in her slop/soup feed if she could develop any respiratory issue though 
. )Which if it is not her lungs, coupled with her eating now and still using the bathroom, all suggests it is her heart to me.
I am like you, I am just trying to make educated guesses and I totally appreciate everyone throwing in their opinions and advice on here. I have not had one real smarta&& comment on here about anything and it is sooo nice!!!
Who knows though, it could still be heaves but not enough of symptoms to fully diagnose.
I am going to keep just doing what I can for her and try to keep her eating, her gut moving, her spirit fighting and her body gaining. I’ve already prepped my daughter, she is almost 10 but I have always tried to make sure she fully understands that it is always about the animal, not us and sometimes the kindest way we can love them is to say goodbye and let them go as painlessly as possible. She doesn’t want to be there when it happens with our pets, but she always wants to say goodbye, understands the whys and hows of the injection and the process, and of course wants to make sure I stayed with them thru all of it for her lol. (I do, but I understand some people can’t and that is ok too…!)
If it gets worse or the vet says look Liz, she can’t thrive, or that she is using up what strength she can manage to gain, to only survive, if her body or heart is at that point, if she tells me it is time with the look we all know, and my mare and my friends senior that lived here, both gave me that look, the I can’t fight anymore mom, I’m tired and it’s time look… then at least she got spoiled and loved for the last part of her life and that makes it money and time well spent for me.
Gahhh I was watching family fued episodes on utube laughing n now I am on the couch bawling like a baby and the phone screen is blurry woman!!! I blame it on running on 4 hrs of sleep!! 
