Kabeet

Hi my budgie lost use of both legs for no reason. No trama or anything. At first It could stand on the perch using one leg but a couple days ago It can’t and it’s just lying on some of the perches. It can’t use its feet at all. It’s been able to fly around but I see that it’s butt seems clogged badly and I cleaned It the first time but it’s so stressful to catch her because he isn’t used to humans and is quit scared of us. I feel like I’m doing more harm in trying to catch her. I honestly don’t know what to do this budgie has a best friend who’s been sticking by her side. I’ve always had happy budgies. I can’t take her to the vet so I really don’t know what things I can do to help ;(((