OMG, Are you sure your in NZ & not Melbourne!!! Sounds like the same friend I have/had!!!
Only mine has never actually ever had a baby & doesnt know anything at all, but still told me my name choices were wrong & she'd come over & go through a Baby names book with me & she'd be the one I should let know when I am heading to hospital, etc, etc so she could let others know!!!
Til I eventually told her one day exactly how I felt!

I told her this baby is mine & mine only (no dp at the time)...
I told her I had chosen names I liked & wasnt going to listen or discuss it with anyone, least of all her as this baby is MINE & had I hvae wanted an opinion on names, birthing, or anything at all I would have asked & as I hadnt it means I dont want now or ever her advice or opinion on my baby!
It did get really nasty as she had terminated a oregnancy at the age of 21 to her long time on & off partner (they are still on & off 14+yrs since starting to see each other)..
She started trying to mkae me feel bad for being pregnant & wanting my baby & her decision for terminating, that she started having a go at me for it!
So I told her she had made her decision & I was making mine ALONE & I really had nothing more to discuss with her EVER!

We did not have contact at all til Maddy was 5! We caught up & I regret letting her back into my life, she is a possesive, self centred cow... She is a person that you would not trust with your DH (although I 100% trust my DH), but she if drunk would want what I have so would bust a move!

Ok well enough about my acquaintance!

I definately think you need to tell her you have made your decisions along with DP/DH & appreciate her words, but you've already got it under control.....
Then just smile & refuse to discuss it anymote changing the subject everytime she asks a q!

Best of luck, but if she is like my friend, DITCH HER NOW!!!!! hee hee!