Am I wrong for feeling this way?

Last night my mom went to this banquet where a couple of teacher got together for teachers appreciation awards. One of them my mom raised, and my mom worked for her mother for 49 years raised all of her children and retired. Well her daughter sent a limosine for her family and my mother to attend this banquet (which is 66 miles from home) I wanted my mom to go more than anything in the world; not for the woman she raised but for the fact I wanted her to feel like cinderella going to the ball, she didn't want to go because it was formal and she is disabled but she went. I told her mom one day you would have to do this for me, and she told me. When will I ever have to get into a limo for you? You don't have an important job. I am a cna I work very hard, and I take care of her and I pay all of her bills. She said that in front of a lot of people and it maded me feel low. I do alot for my mom and this family had hurt me alot in the past and I still put my feeling aside for last night.