Frustrated

Ladies..I need ure help ..my mother in law keeps on nagging all the time on this ,, my husband's sister is always at home no uni or anything and my mother in law almost everyday tells me should I send her over to u n stay for few days to keep u company!! I ignored her many times but seems she doesn't get it that I don't want..his sister is sweet but I can't have her at home especially I'm too loud in sex lol .. I'm really annoyed ..any suggestions ??? She's really getting on my nerves !!