4yo has suddenly started dropping her Ts

[Lafoosa]

My daughter (4 next week) has suddenly started dropping her Ts. Saying things like wo'er, liul (little), pre ey (pretty), etc.
I home educate so I have no idea where on earth she's picked it up from, she doesn't go to nursery and no one at our home ed groups pronounces it like that.
I'm genuinely baffled.
I'm really not a fan of dropping letters when speaking, no offence to anyone that does it.

How do I gently encourage her to use to proper pronunciations of words without making her feel singled out?
(I do live in the north east so it's possible she's picked it up from hearing someone speak that way while we're out, but no one we see regularly speaks that way).

Please don't comment with opinions about home ed, I've had that on previous posts that have nothing to do with it and I'm not looking for any advice there.

Thanks 😊

My DD did that for a long time. Quite annoying isn't it?

I think I'd do this SLT progress checker as for my DD there were other problems with her speech and language that weren't as obvious.

You know she has the ability to pronounce her Ts, so there's no worry on that front. If this speech pattern isn't being reinforced in any way (favourite TV programme or whatever), it won't last long. You don't need to do anything about it. She'll end up speaking like the people she associates with most.