Does Diana No Longer Human get +2 from being brought back by Heedless Resurrection?

Ruling

No, Diana, No Longer Human does not receive the +2 Might bonus from her ability when she is brought back by Heedless Resurrection.

Reasoning

1. Definition of "Play": In Riftbound, "playing" a card refers to the process of moving it from a non-board zone to the board. Diana's ability specifically triggers "When you play a spell."
2. Heedless Resurrection is the Spell: When you play Heedless Resurrection, you are playing a spell. If Diana were already on the board, she would trigger her ability upon the resolution of Heedless Resurrection.
3. Diana is the Target: When Heedless Resurrection resolves, it moves Diana from the trash to the board. This is a game action (moving a unit to the board), not the act of "playing a spell." Because Diana is being moved to the board as the effect of a spell, she is not being "played" as a spell herself, nor does her entry into play constitute the act of playing a spell.
4. Trigger Condition: Diana's ability reads: "When you play a spell, give me +2 [S] this turn." Since the act of bringing her back from the trash is not the act of playing a spell, her ability does not trigger from that specific event.

Summary of the Sequence

1. You play Heedless Resurrection (a spell).
2. If Diana were already on the board, she would trigger her ability at this point because you played a spell.
3. Heedless Resurrection resolves. As part of its effect, it moves Diana from the trash to the board.
4. Diana enters the board. Because she is entering via a spell effect and not being "played" as a spell, her ability does not trigger.

Note: I could not fully verify this ruling against the retrieved rules.