Urgh - Mystical Joy vultures, I've got one too. Mine claimed credit for my successful labor, apparently she was 'sending me distance reiki' the whole time and that's why i managed to deliver my breach 9lb baby naturally
I didn't laugh at the time, but now every time something unexpected goes well in our lives we both say 'it was the reiki' and fall about laughing.
Best way to deal with a mystical joy vulture (so named because they swoop in and turn any positive event into the 'them' show by claiming some divine reason why theyre the most important person in that situation - often reiki, talking to the dead, fortune telling etc. Any excuse to insert themselves into the narrative of everyone elses joy) is to laugh at them. You can't change their behavior, so dont try, but change your reaction and feelings towards it.
More stuff mine has done: When we bought our first house, insisted it was haunted and refused to visit until we allowed her to cleanse it with sage. We didn't allow this but remarkably, a couple of weeks later the spirits told her they had accepted us so she could then visit.
Gave my jaundiced, hungry 7 day old baby Reiki against my express wishes to 'help him take the bottle'. He was breastfed, started gaining weight shortly after and of course this was all down to her quick thinking with the Reiki.
They do it because they cant stand not being the centre of attention.
Also if she calls your baby by the wrong name again, just start calling her Neil and if she asks why you're calling her that, say 'oh i communicated telepathically with your inner soul, that's your name' 