Annidollxox, could it be your aunty is bipolar. She sounds very like someone I know who is. Poor boundaries, bankrupt multiple times, upheavals, drama.
Obviously she's projecting her feelings about her child on you, but you are not her child, you are your mums and dads child so really that relationship interpretation is all in her mind.
Now, you need to let everyone know that you're having difficulties with her being overbearing, and that you'd like her to step away a bit.
You need to do damage control and ring everyone and explain how you feel about the situation. It's a pita to have to do it, but unless you want everyone believing the stuff she's coming out with, you've got to do it.
Tell your aunty you're due a week after you actually are, and ask everyone you want there not to let her know you've gone in to the hospital. I agree with clawhands, you need to ask the staff in the hospital before you give birth to screen her off, so she can't get in. It's for your own peace of mind. Talk with your midwife.
Wrt accepting gifts etc, just repeat, "you're very good to think of us, but we have everything from last time, so we don't need anything" and keep repeating.
I hope you have a lovely birth, and wish you and your dp all the best. Let us know how you got on 