Probably a bitter, tight-assed MIL found one dildo on a nighttable a few years back and by the time she got through spinning her yarn Whitney practically has her own home sex shop.
Not saying the bitch isn't fucked up. And probably even enough to forget to hide the dildos. But if large numbers of anything is scattered about cluttering up that pad my guess is it's more drugs/drug paraphenalia than sex toys. MIL is probably mad Whitney is hogging the good shit.