Without knowing your budget, it is hard to suggest the right car for your needs. However, the best options to consider are the Kia Carens Clavis and Maruti Suzuki Ertiga. The MPVs have relatively low floors and large rear doors that will make getting in and out more convenient for your mother. Also, both of these cars deliver a comfortable ride. The Kia Carens Clavis does have a softer and more absorbent ride quality, especially on versions that ride on 15-inch wheels.