Cherrydrop

I am a nursing student and an agency CNA, working in nursing homes. Yesterday I worked a shift in a nursing home I hadn't been to before. I was allocated patients to bathe at the start of the shift and I was told by the RN that I should be able to manage on my own and I would be able to turn the patients with no assistance. I tried to turn a patient and was not able to, so pressed the call bell for help, which took some time. I had managed to bathe the front half of the patient but there was no way I could turn them to change the pad and wash their back. I told the RN afterwards about what happened and she said it's normal for staff to try as much as they can and then call for help if needed. I do not think this is acceptable. The other CNAs said the majority of the patients always need 2 members of staff to bathe them properly. I feel that making the patient wait for another staff member to turn up is undignified, as they feel vulnerable being bathed and for some the process of being bathed is very distressing and I don't think they should have to wait any more than they have to. I also feel it's not fair or safe on the staff to strain their backs trying to turn a patient on their own. Every other place I've worked if a patient has a history of needing 2 staff members to bathe then 2 staff members always go into the patient in the first instance. I called my agency as soon as I could who told me to email them my concerns to have it in writing, which I did. Am I overreacting or is this acceptable?