Pig won't walk

Hi guys. About 2 weeks ago I came into our barn for the morning feed and saw 1 pig (out of 3) lying and not getting up. They usually come right over to the fence when I come in with their food. I saw 1 pig climb over her and she just squealed, didn't move. So I went it and tried getting her up, and checked her leg. It seemed like she was favoring her right back leg. I did manage to push her up and she wouldn't put any weight on it, and screamed the whole time. If I touched her leg with a bit more force, she squealed. We seperated her from the others, since she weighs a ton, we couldn't carry her, so eventually after fighting with her she got up and hobbled, we just had to guide her into a makeshift pen, and she laid there for about a week. She wouldn't get up. She has a trough with food and water, but she doesn't go there to eat, she only eats when I feed her. I bring her a bucket of hog grower and water and then she will eat. I checked to see if something was broken, I'm by NO means an expert, I was pretty much just looking to see if something was at an odd angle, and nothing seemed out of the ordinary. I thought she might have sprained something. I did feel her leg and I noticed a spot was warmer than the rest of her leg, I don't know what the official term is, but if you compare it to a human, it would equal her knee on the back leg 😂 well one day she broke out of her makeshift stall and hubby dear decided if she's well enough to do that she can go back in with the others. So he put her in, but now the other 2 pigs started biting her. I thought they would kill her, so we built a fence in the middle of their pen so now they are "together" but have a divider. Now for about a week she is still lying around. She changes her position from one side to the other, but she won't go to her trough to eat or drink. She will only do that when I bring it to her. I mean, it makes sense if it hurts her to walk. Yesterday and today I felt her leg and it's not warm at that spot anymore, and she doesn't squeal when I touch her leg. I pushed her up from behind and that's when she starts squealing. It seems she still is having trouble standing, when she does stand, her back end is always leaning on the fence. I pushed her to her food, and she ate a tiny bit, but then she "walked" all along the perimeter of the fence and after much trouble laid down again. While she was standing I noticed that the OTHER leg, the whole leg is at an angle. I can't bring her to a vet since I don't have an trailer and the vet charges an arm and a leg to come out here. I will try getting a picture of the legs. I'm wondering if maybe it would be better to put her down. I really don't want to do that, but she shrunk in weight to half the size of the other pigs. I thought she was getting better, but now with the second leg... Could it be that her muscles got weak cause she didn't use them for 2 weeks and that's why she is having trouble walking? Her whole back end shakes (shivers) when she is up, as if it's weak. Does anyone have any advice?