Is her name on the lease? If so, that will be sufficient to register with a GP and to open a bank account.
For the next visa, you mail in either individual names (12 items) or joint names (6 items) spread out over the two years prior to her visa renewal. This doesn't have to be bills, but can be from other sources such as NHS, HMRC, DVLA, etc. Save everything and do not go paperless.