I wouldn't lie
I wouldn't "forget" to tell her you are in labour
I would tell her straight, now, that she is not to bein the labour room with you
that this private, between you, your dh, and your baby
I wouldn't even want her outside, in the waiting room
when I was in labour, my mum and sis took the day off work and came to the hospital
the MW asked me did I want them to come in (in the early stages)...I said nooooo
the silly sods wasted a days annual leave....
back to you....your DH needs to find his bollocks, and tell her straight
if you don't, this could set you up for continued intererence and meddling in your life