HELP PLEASE!!!!! Obsessive mother in law!

Okay so I have a few points to make about my boyfriends mum. Me and my boyfriend are childhood sweethearts (cringe I know!) and I've lived with him and his mum several times over the 12 years I've known them for like 6-7 months at a time, when things have got too much for me at home, she even fostered me for a while. So she thinks of me as her own, which is fair enough. 
But now, since me and my boyfriend announced we were trying for a baby she's become really obsessive! 
First of all- she was like 'when the time comes and the baby is born I want to be in the delivery room with you' and I said no, the only people I want in there is my boyfriend and my own mother. To which she started going mad and saying I'm trying to take her son away from her! 
Then- she's already started buying baby things and I'm not even pregnant yet? 
The thing that's got me the most!!- she said that when I do give birth, she's going to come to the hospital and take the baby home with her for a week so she can get to know the baby! And I said no! The baby will come home with me and my boyfriend! And that when the time is right and we feel ready people can start coming to our house to meet baby. And then she started kicking off! 
Is it just me or is she way too obsessed about this? It's made me think about giving it up all together a few times now. I just want a nice private life with me and my boyfriend and our hopefully baby soon! Is that me being selfish or am I right here? I'm so confused about it all. 
My boyfriend feels the same way I do about this and it's just starting to get too much. She puts me under so much pressure. Even asked me to name my baby after her if it's a girl or a boy! (Her name could be shortened to be a boys name)  Can anyone give us any advice at all? I'm really struggling to cope with the pressure as I have a few mental health problems of my own (which I'm treated for and has been cleared safe for me to have a baby by the doctors) 
Help please!!! Thanks all xxx