Check the crop first thing in the morning. Checking during the day when she's been eating/drinking does not tell you a lot about crop function.
Your hen has a breast blister which is not that uncommon. It doesn't look too bad right now, but if she's not able to get up and move about on her own, then it will eventually get worse.
The blue tinted bump looks like it may be a blood blister or perhaps an ingrown feather. I'd just monitor that spot to see if there's any changes.
I do agree, if she's not improving, then it may be time to re-evaluate her quality of life. It's never easy to let one go. Sit down with your Mom and discuss this practically, come to a conclusion together. If you both feel it's time, then stick with it. If not, then re-evaluate daily.
I'm sorry she's not doing well; it can be very sad to see them in decline.