Abby Lee Miller Prison Made Me Tough as Nails ... Check Out the Mani!

Abby Lee Miller is halfway back to normal on the heels of her prison release -- 'cause she just got her nails done on the outside for the first time in almost a year.

Abby was spotted Thursday hitting up Pampered Hands -- a nail salon in WeHo -- just a couple days after being transferred to an L.A.-area halfway house to finish her sentence.

As you can see ... the former "Dance Moms" star was all smiles, and even appeared to be rockin' a dance-themed shirt. Old habits die hard, we suppose. Oh, and in case you're wondering ... she's allowed to go out for stuff like this, so long as it's approved.

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