Without being there it's hard to say - however I severely doubt that two nurses who dedicate their daily lives to saving patients just "stood and watched her fall off the bed and left her there"
With the caveat that the wife is out, so I can't check with her....I'm pretty sure nurses are instructed to allow people to fall - they can steady them if they stumble, but once they are actually falling, they should just allow it to happen.
This is because the chance of injury to the patient from a fall is really quite low - it won't tend to be from that high, and as humans we are designed to fall fairly well - we bend and have limbs that we instinctively throw out. The chance of injury to both the nurse and patient from intervening is much higher.
Consider this - "2 nurses watch an old lady fall out of bed" may not sound great, but it sounds a damn sight better than "nurse dislocates old lady's shoulder and puts her own back out, stopping her patient falling out of bed".
As others have said, once a patient has fallen there is a process, requiring medical assessment and correct equipment - you'd be surprised (horrified?) how many wards/patients are often sharing specialised lifting equipment. A patient on the floor may look awful, but they are not going to injure themselves or others.
While it's nice that other patients rallied round, their decision to assist was emotional, not medical.
Nurse do many things that look horrific out of context. I've seen patients crying because a nurse forces them to get out of bed...except that process is actually part of their medical treatment; waking people up to give them drugs (timing is critical); withholding painkillers (dosage levels/contraindications) - unfortunately the process of making people better is not always pleasant to the outside, untrained observer.
If you have concerns, you absolutely should report it - just remove some of the emotion/speculation (who diagnosed the stroke?) and dial down to the facts, the whole process should have been documented.
Without being there it's hard to say - however I severely doubt that two nurses who dedicate their daily lives to gossiping at the nurses station just "stood and watched her fall off the bed and left her there"
You want to chat to some nurses about their typical range of duties and responsibilities compared to their relative pay before you make a stupid comment like that. For every bad story you've heard, I guarantee you their are hundreds of thousands of good ones that you don't hear about because it's part of the normal working day for a nurse.