MIL has upset me a bit :-(?

hey, well I'm 38+5 days pregnant and I know I am very hormonal as well. my fiance is being so good with me, I get teary over nothing sometimes, but his mum is really upsetting me a little. since we became pregnant she has been very excited. at first it was really cute! she was all excited but then I felt like she started to cross the line as well. I feel like she forgets that we are having the baby, not her and her son. she loves to take him shopping and when I show interest and looka t what they are looking at she just loses interest. we were choosing cot sets and when my DF fell in love wth one she got really angry until I gave in and said yeah we'll get it then. (I would have gotten it anyway, but no need to be mean) she's often telling me how I should act as a mum and how I'm going to find it hard. she thinks I'm too forgetful to be a mum (I forget my keys occasionally, probably more than most ppl, and she KEEPS saying I'm going to leave the baby in a shop and forget it) it was funny, but not so much anymore. we decided to try to not use dummys, but it was just an idea, she told my DF that I'm stupid for thinking I can go without them and she's going to keep a pack in her handbag for when I fail. who actually says that!!! recently though it might be my hormones, thats what I want to know. she bought a cot for the baby for her house, but instead of setting it up in the spare room (where we would sleep and where my mum has set hers up as she lives interstate) she's set up the cot and baby things in her bedroom next to her bed! I've told her I don;t want to be away from the baby when he is really small but she keeps saying its what her parents did to her and they will take baby for weekends away. she actually has a binet already set up in her room. I was a little shocked, but I appreciate that she's spent so much money, its just my mum more spent money on our nursery and got all second hand stuff for her house for when we go and stay. another issue recently, we got a puppy (my DF s a cop and rescued her from a man living in a car) and we fell in love with her. but the reality is we can;t really afford the vet bills (well, we can, but I would rather spend the money on baby) so we found a family for her, but then DF mum said she wanted the dog really badly, so we gave her to them. now she sits with the puppy and tells her she's living with them now because I couldn;t do a very good job. I know I'm too hrmonal but it really really upsets me. one last thing, I got weighed the other wee and have put on 9 kgs since the start of my pregnancy, my OB said this is a bit on the low side, I should have put on more like 12-15 kgs. well I was pretty excited about that! he said that the baby is fine I might just have lost a little bit of weight (not on purpose at all). well, my mum tried to feed me more, she;s so sweet, but my mother in law just laughed and said 'that sounds like a lot more weight than you should have put on for just baby and fluid. maybe it was different in my day but we weren;t allowed to put on too much fat, but things must have changed' it really upset me. being nearly 39 weeks and huge, I'm a bit sensitive. what do you think? am I hormonal and over-reacting, how have your mother in laws acting? thanks for taking teh time to read, I know its an essay