Would it have killed the shop assistant to have helped?
Would it have killed the OP to have opened her mouth to ask for help?
I can see why op didn't ask given how flipping rude the woman was, it was obvious she wasn't going to help
No it wasnt. The woman scanned the items, gave the bags the OP requested and then stepped back from the counter, which is standard procedure for most retail environments at the moment.
She did not offer to help but neither did the OP ask for help. What was she supposed to do? She cant leave the till area, she has probably been instructed not to offer to pack as standard but will do so if asked - as her colleague was doing - and was trying to respect the customers social distance as much as possible so stepped away from the till to let her pack as she wished since assistance had not been requested.
Additionally the OP did say she asked for bags so she could bag them separately which most people would assume meant that the OP wanted to do it herself, especially when she was told there were no packing materials kept at the till (and tbf who ever expects the pound shop to keep bubble wrap at the till for delicate items? I wouldnt ever expect that service anywhere except at a higher end/department type store). The woman probably assumed the OP would want to pack the items herself to ensure they were packed correctly, or maybe she wanted to rejig the shopping she already had to accommodate separating the pumpkins to different bags, so stayed out of it to avoid the OP being annoyed at her touching the items repeatedly or making the process harder by doing it differently to how the OP needed it doing?
She also probably folded her arms because she either didnt know what to do with her hands or to stop herself fiddling with something behind the desk - I work retail and have found myself crossing my arms more because it means my hands aren't free to touch things unnecessarily and then have to sanitise everything repeatedly.
She also apologised to the queue because that is what retail staff are required to do when there is a hold up but they know there is nobody they can call to assist them. So instead of ignoring the queue, they acknowledge that they have been seen and will be served as soon as possible.