She may say something incorrectly and rather tell her you say it like this, I usually say "oh, yes it did disappear". So just repeat in the correct context rather correct her directly. Seems to work on most occassions.
Yes, that's what we do I never correct her, I just say the word correctly myself. We downloaded an app for the "g" sound today and she was so excited because she thought she was saying "g"... but she was still saying "d". Never mind... I won't push it.

I like the chart above Then I won't have to worry!