Release her hands by shredding what she's still wearing

"I suppose I did."

You put your fingers on your chin, looking pensively as you take in the view of her exposed chest, and her hands stuck to her thighs.

"You can't carry your clothes with your hands stuck like that. Let me assist you."

You move at the speed of light to stand beside her, and take out your pocket knife. You stuck her hands underneath the waistband of her garter and then tied her wrists to her thighs, so you start cutting up all she's still wearing to free them. First, the bonds around her thighs, then you cut the garter into shreds in a multitude of place, and finally for good measure you cut up her thong as well.

You walk back to your original location and let time resume.

As her hands come free her underwear falls apart like so much confetti, fluttering to the ground. The elf looks down to see what happened and her face snaps back up at you, with a hint of surprise, and a great deal of embarrassment. Her first instinct is to put her hands over her now exposed crotch, before realizing a moment later her tits are still uncovered, and she adjusts her arms, putting a hand across her boobs.

You smirk, "Now that your hands are free, here's your stuff."

You fling the bundle of her clothes and staff to her, and she has to expose herself again to catch them, before pressing the clothes against her body.

Humiliated, she turns around to put her bra back on and slip the robes over her head, and you enjoy watching her squirm trying to get dressed as quickly as she can.

She doesn't waste any time, and when she's done she practically dives out the window, sliding off the sloping roof to rendevouz with the other elves, who are huddling in the shadow of the stables. She's in the best condition of the three, all she lost is half her underwear and her dignity.

The elves talk for a few seconds, and the best you can pick up are snippets along the lines of "never speak of this again", before they slink off into the night. Another job well done.