This question may have been asked numerous times, and I apologize if it was. What happens if a properly summoned dark necrofear that has been removed from play is summoned via RftDD and is destroyed by a card effect during that turn. Will dark necrofear return and equip to a monster at the end of the turn or be removed from play due to the effect of RftDD?

The effect at the end of the turn that lets RFTDD remove monsters again only affects the monsters that are still face-up on the field at the end of the turn you activated RFTDD. If Dark Necrofear dies by an effect and is send to the graveyard before the turn has ended, it stays in the graveyard even at the end of the turn and its effect may be applied. All monsters brought back by RFTDD that are destroyed and send to the graveyard remain in the graveyard even when the turn ends.

To put it in simpler terms, Dark Necrofear Isn't a monster any more. She is not an Equip Spell Card. She doesn't count as a mostner.

actually to put it simply, once a monster summoned by RftDD is flipped face down or leaves the field, it is no longer affected by RftDD.