im hving in-law probs too, in fact, my husbnd just left me 2 days ago because he thinks im being unreasonable, that i keep the baby away from his family, that im beinG unfair. im pregnant with our second baby, 10 weeks, and really stressed.
What you want for your baby is your business. You do not need to justify or explain anything to anyone other than your partner. Its very rude for people to not listen to and accept your opinion. It may be a conversation your partner needs to hsve with her.
I would ask to take a look at it first. If it has gotten bad you can point it out to her and explain your concerns and show her the proof. She can't deny what's right in front of her. If she still insists then put your foot down. This is your baby not hers.