@Raven08 sounds like she won't be going home until her infection markers improve, the doctors sound like they are still trying to identify the source of the infection and get it under control.
They always start planning ahead of time for discharge especially if they think a person might need more support/be less independent going forward. That is actually good practice and avoids a rushed, unsafe discharge. The physios will be looking at her home environment to see if it is safe and suitable given her current mobility, they work with the OT's to get equipment and adaptations in place before discharge. Many people recover better at home in a familiar environment with support, it is not always a negative. Be clear with the discharge team that you cannot provide any family care support so they don't try to discharge home without care in place if that is what she now needs.
In my DF's case when he went in a year ago (previously had no care in place) they did a diary of care on the ward to look at what he could manage independently/what support he needed before discharge. You can ask the ward staff to complete one. They then sent the discharge to assess team (carers, physio, OT) to his house for two weeks 3 X a day to see how he managed at home. He clearly wasn't able to manage independently and wasn't becoming more independent as he recovered. We then got carers in place longer term following their assessment. The OT also ordered some equipment for his home to help, some before discharge, some after they saw what he needed.
Physios might also offer community rehab locally or offer home visits for a period of time, it all depends on your area and what she needs. My niece has home physio rehab visits due to her mobility issues. Ask the physios what support will be in place for rehab after discharge.
Also see if the hospital has a Frailty Team (FEAT) who review complex cases like your DM's, they are sometimes called elderly medicine or some other name. They tend to look more holistically at the whole picture. My DF saw them before his recent discharge and they were very thorough looking at all his medical conditions and the impact on him, the pharmacist reviewed all his medication, physio assessed his mobility and the OT discussed his care needs with me.