Considering adding a second moh

I asked my BFF to be my MOH because she is my oldest friend/she is basically my sister and I wanted to honor our special relationship. I did this, however, without expecting her to take on the usual duties of a MOH, because she lives on disability income, as well as living a fair distance away from me, and so she doesn't really have the means or the availability to fulfill those duties, which is 100% fine with me. The thing is, one of my other bridesmaids has been really stepping up and has basically been voluntarily taking on a lot of MOH duties. I super appreciate this and want to honor her for all her help, so I was considering making her a second MOH. Will this make my current MOH feel less special/make her feel guilty for not being able to help out more? If I make this bridesmaid a MOH, will she become resentful that her co-MOH isn't helping out with much? Will this make the other bridesmaids, who have also been helping out with things here and there, feel less appreciated? The ladies in my bridal party are incredibly important to me, and I just want to do right by all of them.