In my daughters comp bag - water bottle, grips, small back of snacks (cheese cubes, sultanas, rice crackers etc - nothing too crumbly) small plastic bag with a couple of hair slides/clips and some hair bands (if her hair "collapses" at least the coach can tidy it up) spare pair of socks (part of club uniform) pocket pack of tissues... all this stuff goes out on the floor with her.
Stuff I find useful to have in a bag with me - hair brush and fine tooth comb, small spray bottle of water/conditioning spray to smooth down fuzzy flyaway hair, hairspray, glitter spray for hair, spare clips/bands/hair ribbon, tissues, baby wipes, lip balm, a few bandaids.
I tend to throw in a few snacks such as a sandwich or fruit for dd and myself - not all meets have food available and dd is often starving the minute she is finished.
Don't forget the camera/video and charge the batteries.
14.5 is a great score on beam
I hope you both manage to have fun.