As an adult who is 49 years old, you are legally and emotionally independent of your mother. You have the right to make your own decisions and choices, including whether or not to take an Uber by yourself after dark. You are not obliged to obey your mother's wishes as if you were a child.
However, living together may involve some level of compromise and respect for each other's concerns. While you have the freedom to make your own decisions, it's essential to consider her perspective and have open communication about your plans and safety. You can discuss your reasons for wanting to take an Uber and address any safety concerns she may have.
Ultimately, you should prioritize your own well-being and safety while also maintaining a respectful and understanding relationship with your mother. It's a delicate balance, and finding common ground through open dialogue is often the best approach.