She has grown. Her model is bigger than how it was in MoP. But it's only been around 3 years since we last saw her, and she was a pre-teen.
Never use WoWwiki as a reference. It is outdated and not approved by Blizzard. Unlike WoWpedia which is (as you got links from the official WoW page to wowpedia)
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Lies!
I saw Taoshi in my garrison while leveling up via the Inn building.
You also see Pandaren npc's in one of the alliance bases in Nagrand in WoD.
Panda is wise and people complain about stereotypes
Pandas are all fat and people complain about stereotypes
Pandas are pompous and people complain about stereotypes
Panda is none of these things and they still complain
There's nothing wrong with Lili. She's a little annoying sometimes but that does not make her a bad character. As far as WoW characters go she actually has depth.
World needs more Goblin Warriors https://i.imgur.com/WKs8aJA.jpg
There are plenty of characters that have aged differently due to a mixture of gameplay and story.
Li Li hasn't aged much, but Anduin has. Nomi is now a teenager or a young adult. Moira's son is still an infant. The orphans from Children's Week have never aged - even with updated quests in Cataclysm. Plenty of other named children from Vanilla weren't changed in Cataclysm as well, as a matter of fact. Though, of course, there are quite a bit of varying levels of importance between all of these characters.
All in all, they won't age until they're super important again. Out of all the characters I've listed, the most important/shown is Anduin, with Li Li coming in second. She's actually had quite a bit of coverage since MoP, even having short stories and comics with her as the protagonist. They'll age her if she shows up more or has a bigger part to play. For now, fans of her seem to like her as she is now.
3 hints to surviving MMO-C forums:
1.) If you have an opinion, someone will say that it is wrong
2.) If you have a source, there will be people who refuse to believe it
3.) If you use logic, it will be largely ignored
btw: Spires of Arak = Arakkoa.