That would have likely gone down differently in my 3E games.
The Trolls had a +14 Grapple bonus, and are at +9 to hit with Melee touch attacks vs the Bladesingers Touch AC (no bracers or shield) of 18 (2 attacks each) to initiate the Grapple.
Once grappled, the Elf loses his Dex bonus to AC, and all Dodge bonuses (such as those granted by Expertise), reducing his AC to 21 versus the other 24 Trolls.
They then surround and maul him to death at +9 to hit with his d4 hit dice.
Seeing as the Elf almost certainly dumped Strength, they're now in a world of hurt, and likely pinned in the following round (reducing their AC by a further 4).
Bullrush (+10 vs the Elfs bonus of likely +0) is also an option.
More than one way to skin a cat.
That would have been no possibility. I think I forgot to mention the ring of freedom of action*.
Which nearly killed her later. When she slipped and was threatened to fall down several 100fts, the helping hand of her ally that tried to grab her was of no use either.
On a different note: no, strength was not dumped at all. She wielded her longsword just fine (she only had 18 dex probably...). But she had rolled the stats of her life...
... while the poor bard had 14,13,12,10,9,8 for stats (and he created 10 peasants or so before he got those high numbers...)