I am so glad you went to Disneyland. It is my favorite of all of them. I love the fact that your mom's name was prominently displaced at the front of the boat. All of you need this outing to help relieve the stress and reconnect once again.
It sounds to me like your mom was telling you that she was okay, i.e., especially after hearing the Red River Valley song.
Keeping all of you in my thoughts and prayers. Please take care of yourself. You've had a lot going on in a very short time period.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.