I recently did C25K, and the thing that helped me the most was having a friend doing it at the same time. She wasn't even local - we'd just send each other texts, with a little trash talk

, and it kept us both going through the end. I even ended up sneaking an extra run in every week so she wouldn't get the better of me! If you don't have a friend you can recruit, maybe you can make yourself accountable to your daughter -- so you plan a run together every weekend or something, and follow it up with a special trip to the coffee shop together (or whatever) if you've made your goals for the week.
Also, if you start now, you have more than 8 weeks until the 5K. Plan on doing each week twice if that helps you feel less overwhelmed. I think a lot of people get discouraged around week 5, when the running gets more intense, so you might want to plan in advance to build in some extra time around then or otherwise do something to keep yourself inspired.
I've been struggling with running now since it's cold and dark when I typically have time to go out, but remind yourself that we're getting closer to spring and that getting outside for a run will only get more appealing as you get further along in the program. I'm gearing back up for the 10K program now and need to remind myself that!
Good luck!