We've just had similar with my grandma but she lives on her own.
My info is third hand from my aunt, so I may not get the terminology correct but this is what happened.
The hospital should do a needs assessment before she goes home. They then discharge with a temporary care package in place. My grandma had Personal Care, allocated up to 6 weeks. Carers to come in 4 times a day to help with medication, shower, dressing, toilet.
Once home grandma got a visit from the care manager to make sure her needs where being met (she lasted a week and then refused to engage with them.... But that's another story about a fiercely independent woman who is incredibly stubborn!)
Whilst recovering from a fall there is a higher risk of falling again. It is therfore in everyone's best interest to look after her.
As you have issues with helping with self care, she is at risk. Don't be railroaded into offering help (even if you do actually do it, which is understandable) the assessment needs to be done as a worst-case scenario perspective (ie you're at risk because of osteoporosis, husband's arm is unable to take the strain).
You need to speak to the Occupational Therapist, ask the ward manager for the contact info or to make you an appointment whilst they visit your mum.
Every hospital and local authority work differently, but this was our experience of Winchester Hants.