Read and advise without insults, please 🙏

Please help me throw this out to the public so I can make a fast decision. My late elder sisters daughter started living with me when she was 9. Me and my husband and I trained her in school. She is doing her youth service now. The way she behaves now is making me regret even allowing her inside my house. She comes inside the house with takeaway food and tells my children that she has graduated from eating one type of food . She frowns when i scold her for bringing visitors to my house without my consent. These days, she is telling my husband that he has poor dress sense and she is now the one telling him colors to wear. At first, I didn’t see a reason to worry, but for her to go outside and buy 3 new ties for my husband raised my suspicious eye. She didn’t only do that. She even got him cufflinks to match with the ties. My husband was just thanking her. Is she not supposed to ask me or take permission from me before buying anything for my husband in the first place?

Is she supposed to be in my house and be buying gifts for my husband? She has never given me a pin before. I have trained her, and I never for one day maltreated her. Please, I need advice. I really wanted her to start working at our company after service ,but i don’t think i can employ her with this her attitude anymore. She is 24 years old.