Is she ready?
BabyCenter offers a checklist that you can go through to see if your child is ready to be potty-trained.
Considering you already potty trained her once, I would guess that she meets the physical and cognitive "requirements" of potty training. Since she was highly successful (an accident once every other week or so), I would also suppose that she met the behavioral requirements.
Without knowing all of the details, I would still be willing to assume that, yes, your daughter is ready.
Why is she having problems now?
Potty trained children regressing is a fairly common occurrence. Children will start wetting their pants again for a variety of reasons:
- They're too engaged with their activities (which seems to be your case!)
- Big changes in their life happen (such as a new daycare, preschool, or sibling)
- Realizing their Pull Ups work just as well as diapers for pee
- And more
Sometimes it can be hard to determine what the reason is, so you've got to try tackling all of your bases. However, it seems here that we have a pretty good idea as to why your daughter has stopped using the potty: It's boring, and she'd rather be doing her fun stuff.
So, now, you'll have to treat this as a behavioral problem. Your daughter now knows it's not okay to wet her pants anymore. She knows she needs to stop playing when she needs to go potty. Instead, she's refusing.
What can I do?
You're going to have to force some consistency on your daughter. Since she's refusing to go on her own schedule, I would start making her go on a schedule of your choosing.
Every [X] hours you can have her stop what she's doing and take a trip to the potty instead. She doesn't get to argue or keep playing (or doing whatever). She just has to go. If she refuses, you could use your existing discipline system. Typically, it's not recommended to discipline a child during potty training, but she's technically already potty trained and is now misbehaving.
This method is very controlling, however, and doesn't really set up your daughter to be independently successful. It may work, but it'd be better to instill motivation in your daughter to take care of herself without your control.
One way to do this would be using a simple sticker chart type of concept. If your daughter uses the potty without wetting her pants, she gets a sticker (and maybe some candy, too). If she has a sticker for the last time she went potty, then she can choose when to go to the potty the next time (which may be when she's not having as much fun). If she wets her pants (no sticker), then she has to go the next time whenever you tell her to.
Personally, I would choose the times that are most inconvenient for her, so that she learns it's better to do it herself! If your daughter is allowed to watch TV, for instance, the middle or end of an episode is prime time to send her to the potty. You may deal with more tantrum-like behavior or arguments during these times, but if you can calmly let her know that she could have waited if she'd earned her star, then I think the message will get across.
If she tries to go when you tell her to, but can't (because she doesn't need to), then I would still count it as successful (gets a sticker). Unless it becomes a problem where she's constantly wetting herself 10 minutes after you made her sit down, there's no reason not to count an attempt as a success.
Another trick that may help is getting an electric egg timer. You can get one pretty cheap (I recently bought one for $6 or $7 at Target), and they allow you to set timers for longer stretches than conventional egg timers. To use the timer, I would set it for 2-3 hours, and explain to your daughter that when the timer goes off she should go to the bathroom if she needs to. The alarm on the timer may be enough to snap her out of whatever else she's so focused on. This is a more passive trick, though, and may not be successful if your daughter is willfully choosing not to go, versus some kids who forgetfully don't go.