I don't think you're failing her at all--don't be so hard on yourself! Most folks don't even have this on their radar. At 15 months, there's so much going on. it can be a good time to start up again though, just play it by ear. Here are some things you might try (you know your dd best, so you have the best idea which if any of these might be helpful to her!):
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1. maybe back off on offering and just tell her to let you know when she needs to pee. At 15 months, she's probably starting to understand a lot, and may start to tell you again if you leave it in her court (depending on if she's stubbornly independent like my dd...maybe she's just asserting her own independence?) Only offer if you are REALLY sure. If she doesn't go, don't offer again until she tells you she needs to go or has an accident. This helped with my dd a lot for a while. I was offering too frequently, and she was getting pissed off.
2. Perfect the line "oops, you peed. That's okay, next time you can try again to get it in the potty." Say this any time you notice that she peed somewhere else (diaper, floor, etc). There's no shame, but gives a quick encouragement to try again and a reminder of the goal.
3. maybe she just likes standing up? If that's part of it, maybe you could encourage her to pee int he bathtub? Perhaps the novelty will excite her about it again?
4. Just go for the first morning pee?
5. Maybe just start again at night. Oddly enough this was our most successful time for a long while. In her sleep, my dd always signaled really well by popping on and off the boob if she needed to pee. Every time she woke up, I'd try to nurse. If she did the popping on and off thing, I'd offer the potty.
6. Most importantly, don't get discouraged/frustrated. Boy can they pick up on that! If it's too hard for you now, just use diapers, it's a fine thing to do! And if you're getting frustrated with ec, it's better to just diaper and not pass on that tension (speaking as the mom of a fiery little girly here!)
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Good luck!
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ps. Make it fun when you can...we had a potty song (I like to potty potty, I like to move it move it, etc....yes it's dumb and ridiculous, but she loved it)