mother in law problems

So our house won't be ready for another two months...we're staying with my mother in law until then...my spouse is not a mommas boy...but his mother refuses to believe that and treats him like he's still a infant and she makes it damn clear to me that's her baby boy....she also wants to see the baby everyday and babysit for us when at work....she gives us no privacy at all and will walk up in our room at any point in time to talk to her "baby boy" she is also best friends with a ex of his and had been pushing for us all to hang out when neither him nor I want that....I'm about to go camping in our unfinished house......I'm losing my mind and it's taking everything in me everyday not to snap, it also depresses me because I don't wanna come out of the room when we are there and I never wanna go there so I will wander around stores with no intentions of buying anything just to avoid her...