MIL's reaction to second pregnancy

Edit: Just to clarify, English is not my first language, so it is more difficult for me to read the "tone" of the message than if it was in my native language.

This is the message my MIL sent me today to congratulate me on my second pregnancy, after almost a month of silence (I'm sure she only messaged me because her son asked her to):

"Congratulations on your growing family. Hope all goes well and I look forward to welcoming the new little one. 👶"

In comparison, here's what my former boss messaged me upon finding out:

"OP!! You're having a baby!!! 🥰🩵🥰🩵✨🥳 Such lovely news 😊 so happy for you all. Massive congratulations 🎊 I hope you're feeling well and little un is growing beautifully 😍 xxx"

Is it just me or is my MIL's message the most impersonal congratulations ever from a future grandmother? Her reaction when my partner told her was to yell "Again?!" (This is my second pregnancy, not counting the very early miscarriage I had 6.5 years ago, so I don't know why she acts like I can't keep my legs closed). She then proceeded to list all the reasons she thought it was a bad idea for us to have another child and then said "I'll need some time to get used to it", completely changed subject and didn't bring it up again until last night when my partner called and told him our due date etc, cause she hadn't bothered asking a thing about this pregnancy at all. The weird thing is that she loves our son, doesn't get to see him often because we live an hour away and she works a lot, but she absolutely dotes on him and he loves her dearly. On the other hand, she hates my guts although neither she nor my partner will ever admit it.