QIf an opponent returns this follower to hand from my field, does its ability still trigger?

AYes, it does.

QIf I play this follower, return it to my hand by playing Floral Breeze, then put Crystalia Tia from my hand onto my field with this follower's ability, do I meet the Combo (3) requirement for Crystalia Tia's Fanfare ability?

ANo. "Putting" a card onto your field with an ability doesn't count as playing it, so your Combo would only be 2.

QSince this follower is also a Forestcraft follower that costs 2 play points or less, can I put it back onto my field with its own ability?

AYes. By the time you resolve this follower's ability, it's already in your hand.