You're right OP is not a bad person and SIL can express her feelings but not to OP
She may well be trying deliberately to emphasise the bad parts of pregnancy and having kids in an attempt not to rub OP's nose in it by gushing about the good.
Huge dramatics throughout the 9 months over what was, a very easy and simple pregnancy.
Mine was easy and simple in comparison with other people's. It was not easy and simple to me. I'm planning to have another at some point and am not looking forward to pregnancy as I do not enjoy it- your sister in law should be able to say the same without being judged for it.
SIL had a complete fit and refused to go to ANY other pregnancy appointment without my brother there- even routine blood tests! Brother ended up getting a written warning from work because he'd taken so much time off! Partly because every time they had a test on the NHS she paid to have it privately as well just in case the NHS got it wrong.
This, to me, speaks of someone suffering from anxiety in pregnancy. She may well have done all her 'if I miscarry, I won't try again' malarky because she was scared of losing the baby, because a pregnancy at forty is statistically more risky and because she was scared of something going wrong and didn't want to celebrate prematurely. Alternatively, maybe she figured at forty she was safe so agreed to TTC to get your brother off her back about it and was really gutted to find herself pregnant.
how she knew better than the midwives because she'd told them she shouldn't have been induced even though she was already 41+5 and as she was 40 years old they had already relaxed their protocol for her as that trust says she shouldn't go over 40 weeks
To be fair to her, lots of women are guilted and coerced into inductions 'just in case' and if this happened to your SIL she has every right to be bitter about it. Inductions are often more painful, longer and can result in a 'cascade of interventions' leading to greater trauma for the mother. Statistically, most babies will be fine if allowed to gestate for as long as they naturally will, though it does get more risky the further along you go. Hospitals have no right to force anyone into an induction, so don't say they 'relaxed their protocol' as if they did her a favour by 'allowing' her to go over 40 weeks.
I appreciate that this is hard for you, OP, but I really don't feel that the SIL has deserved the bashing and name-calling she's got on this thread. Women should be allowed to admit that they don't find motherhood easy. Also, it sounds like most of what you know you've heard from your parents rather than the source- do they perhaps dislike her and enjoy a chance to bend your ear about it?