Advice please getting pissed off!!

I don't know if it's my hormones but my nan is driving me insane I just want her to back off a bit!! Her partner has booked her to see this singer in concert which is like a two hour drive away she said I'm not going if Justine is in labour I said well were not telling anyone when I'm in labour so you won't know I've told her this around 6-7 times and she's still adoment if I'm labour she's not going. She keeps making stupid comments like I said other day I want some new dark bottomed pyjs for hospital in case I bleed at least my dad or partners dad won't be able to see me leaking and I can scurry off to the toilet she said don't be so silly they'll no your bleeding anyway still I don't want them to see she's told me not to bother with maternity pads even tho I had some at the check out making horrible comments calling me fatty and now she's been out and bought a car fitting for baby seat which I told her she doesn't need she's also adoment she's coming up to hospital soon as baby is born she needs to realise she's only the great granma to the baby and back of a bit sorry for the rant but she's driving me mad