No advice, but I just want to commend you for saying how you felt even when you did not know what the outcome would be. That is a huge step.
If you go will it be for you or her (or your mom)? Are you in a place that you can let her reaction go?
Those would be some deciding factors for me. I have the hardest time remembering that just because I say it nicely, kindly and with the least blame I can muster does not mean that I can "control" how the other person is going to hear it.
Say what you mean, mean what you say, but don't say it mean has helped me so much to decide if I am on the right track or not.