Let's play what do we know...
Amber met Krystle while she was still with Kasey, said she was in an "open relationship"
Amber asked Krystle to buy her the snake bite piercings and an ipod touch and complained when the money didn't get there fast enough for the snakebites, and that the ipod didn't have enough GB. There's a video with the messages linked in the main thread.
Krystle visited Amber while she was with Kasey and they went to an Anime convention.
Krystle paid for Amber's plane ticket and taxi to the Airport. We don't know how many seats she had to buy... when Amber decided on a whim she didn't want to live with Kasey anymore and she was gone in a flash. (from one of Kasey's younows)
Krystle doesn't work, Amber has never said exactly why, it's probably because she's on disability for Autism
Amber appropriated everything in Krystle's home as hers, giving tours of her fridge, calling the dog and cats, her dog and cats, and even asked to take the family cat Charlie (who was in his teens) when she was moving out.
Krystle's parents paid Amber 1000 dollars a month allowance while she lived with them and paid for her phone, and she got food stamps. She bragged about this to Aunt Tammy. They still paid for Amber's phone until Destiny started paying for her phone, but she told Aunt Tammy she was proud to be paying for her own phone. (the phone may still be under Destiny's family plan because Amber venmos Destiny regularly for the phone bill)
The trip was supposed to be Amber visited Krystle and Krystle was going to visit Amber too in one huge mega trip, but it turned out to just be at Krystle's house, while Krystle's parents were conveniently out of town, and during this trip, Krystle's girlfriend Nena Becky's ex, (who Amber set up with Krystle) ended up sending Amber a boob pic. No hard feelins tho.
Kasey said he had text evidence that Amber said she hit Krystle, but he no longer has it.
Krystle and Amber slept in the same bed after they broke up
Krystle's parents happily boxed up Amber's things (after Amber packed the boxes too heavy for anyone to lift) and mailed her some of her things after she couldn't get it all in Destiny's grandma's car when Destiny came to take her away.