@Monica12345, I am sad to hear about your Mom. I am sure she would be very proud of you for caring for her in the way you did. Your Mom is now gone home to Our Lord!
For some giving an expression of condolences can appear to be abrupt, hurtful and uncomfortably awkward. It depends where that person is in their life. A response that is infelicitous may be through their own thoughts or understanding of death, dying and the afterlife. Such an event may bring home their own mortality.
Keep in mind a motto: “this is where they are at at the moment, they mean well”. At times as the bereaved we become the counselors too.
Monica, you and your family, including your Mom are in my prayers.