My family is straining me financially.

I am a 25 year old recently qualified doctor and this is my 2nd year working. I have a problem of a mother who I feel like is abusing me financially now. I didn’t mind helping out financially but it was just helping out at first but now I feel like she’s depending on me and it’s taking a toll on me. Last year I gave her money for minor renovations at home and I’m not even sure what she did with it but it’s fine I didn’t complain, I assume she did something well because she’s always been a good and supportive mother to me throughout my life but I really don’t understand what she does with her money because she has a good job and is not really putting any of my siblings thru school now (we’re all pretty old) and I’m sure there’s no student loans to service. I just want some advice on what to do because I’m not sure I’ll manage this year since I also recently purchased a vehicle and I want to look forward to starting my life now, including savings and just putting myself in a general good position financially. Any advice will be appreciated.