difficult autistic adult daughter

I am parent of a with young autistic lady who also has special needs and ADHS. Her behaviour keeps getting worse at home over last few years. She is jealous of her siblings, doesnt like her carers, having many melt downs in the day, and on the days I am at work she is not so bad but when I enter the house she starts screaming, wants me to sit with her and then she starts crying about various things can hot me- at times asks me to do things which are unrealistic. Carers dont last very long due to her behaviour. I really struggle to put boundries with her now, as she would leave house. or threaten to harm herself. Anyone has had witnessed similar situation and have any wise words for me. She has social worker but the support is too little and too slow.