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i am no expert, but a mother of three, and this is certainly something to be concerned about.   It may not have anything to do with mental illness, though. The kissing, bare sleeping, stealing is not appropriate behaviour.   When my children sometimes show highly inappropriate behaviour, i don't yell or tell them they are being bad. Instead firmly tell them that "kissing mouth to mouth isn't appropriate unless you are married etc." or whatever she is doing, and then go on to state what is the correct way to behave.   i first learned this wonderful tecnique from my daughter's school (she has an autistic spectrum disorder) many years ago. It's called ABA and can be used for ordinary children too.   Do this in a positive spirit, with a genuine smile on your face and real love in your heart  (not when you are angry). And every time you see the negetive behaviour repeat this.   It works every time, though not always immediately...   At the tender age of 6 you can completely change a child's behaviour from negative to positive with patience and genuine love.   A child, like an adult, doesn't fail to recognise real love and caring.