First of all her:
>>2572155t
She looks like she has got some rock & roll to her. So my suggestion: **Blue Velvet** after the Bobby Vinton song.
Next:
>>2572160t
Apple Family member or not? You decide. I say she is: **Cripps Pink** (Gala Appleby and Pink Lady's old name, by the way) after an apple variety also known as Pink Lady.
Third:
>>2572165t
Definitely an Apple Family member, hence: **Elstar** after another apple variation.
The last one is kind of tricky:
>>2572170t
So much we know: This is not Sparkler. The problem: We see basically the same pony as a unicorn in "We Got This Together" and as an earth pony otherwise. We could now say that's two ponies.
But "We Got This Together" got every other pony wrong: Some had different cutie marks like Glitter Glow, Linky had a different hairstyle, so why shouldn't she accidentally have been shown as a unicorn and actually be an earth pony?
If the latter is the case: **Mellow Dee**. If that's two ponies, and you want two names, the suggestion is for the earth pony.
Edit: I've checked. She's a unicorn in the intro as well.