YAY!!!! Happy to hear that she is doing better.
My favorite chick, Miss Molly Mouth, got a thread tangled on her leg one day. It wasn't swollen when I found her but it must have been numb as she limped when I removed it from her. She was better by that evening but I felt terrible about leaving...
Stringy objects tend to bind up the intestines. I've heard of dogs eating elastic straps from clothing and requiring surgery to clear the blockage. I am not sure what kinds of laxatives that there are for chicks. Mineral oil? Something to really get it lubed up. <-- total non expert opinion though.