It sucks that she has that conflict, but she will have to leave the first panel 10 minutes early and be ok getting to the second one 10 minutes late. I'd say it's about a 20 minute walk from one to the other. Have you been to SDCC before? If not, on Thursday, I suggest you and your daughter make the walk from 25ABC to Indigo, because it could be very confusing for a first-timer, especially someone who is younger (though I have no idea how old your daughter is). Might as well time it while you're at it, so that you have a better estimate of the time frame that you're working with.