Bad idea in my opinion
She can either be there as a midwife or a sister not both.
The fact that shes a student is helpful as there will have to be someone else there but its still too complicated. What will happen of for example she was meant to be resting after a night shift before your birth?
An exhausted person can be a birth partner but shouldnt be acting in a medical capacity. As a student the idea is that she is being assesed and learning from each birth, so it seems unfair to have that on a birth that she might have been up allnight before or when shes attempting to decipher results of her distressed sister
What if things go wrong? What if its your sister who misses something? What if you are in pain and your sister cant fix it, or your care in labour (eg access to pain relief, interventions etc) is poor. Youll be linking your sister in with that
My cousin had her sister as a midwife (unplanned as trust doesnt allow but it was a quick home birth), and it was an awful experience. My cousin struggled to listen to her in the way you would an authoritive midwife while panicking, and there was a difficult conversation about the baby being very comprised. They both feel it was a mistake
She been envisaging her in a more dola role, or brith partner role like her previous uncomplicated birth. This birth however needed a medical professional with all their training to do things like ecg monitoring, episiotomies and eventually some resus care. It was incredibly unfair to put the sister in a postion where she thought she was going to be the person to deliver a nephew that wasnt well and resus him
Not all births are calm and peaceful, so.e are medical, tense and traumatic
Just have her as a birth partner where she can support you without being involved in your medical care