You'll need an MPQ and DBC editor for this - the NPC model's textures won't change because they use the human female npc textures by default, and unless you wish to go through literally every single npc texture in the game, it's better to just change the NPC model back to female.
To do this, you'd rename the alpha worgen in the MPQ that is utilising it to something else, like 'WorgenFemale.m2', so it's not overwriting the human female model. After this, you'd need to go into a DBC editor, find 'CreatureModelData' and 'CreatureDisplayInfo' dbcs (which can also be found in your MPQs, preferably finding the MPQ which uses the furthest number down the alphabet - for example, Patch-W overwrites Patch-V, yet Patch-X overwrites both those).
With 'CreatureModelData', you'd need to make a new entry that looks exactly how the Worgen model is set out in the MPQ, including paths (an example would be 'Character\Worgen\Female\WorgenFemale.mdx'). Take note of the ID, then go to 'CreatureDisplayInfo.dbc'. Navigate to ID number 50 in there, and replace the 2nd column's ID with that of the Worgen Female's ID in 'CreatureModelData'. Your human female NPCs should go back to being normal.
As for the broken textures on the player model itself, this is to do with 'extra' textures which aren't being applied properly, which are similarly used by the Tauren. Go into the 'CharSections.dbc' and find the 'Character\Human\Female' paths. On the ones that have 'HumanFemaleSkin', you'll need to add the extra textures on the blank column next to it (which should be row 6). I'm not entirely sure what the name would be for these because I don't use the Alpha Worgen Female models, so you'll have to figure this part out on your own. However, be sure to add the Worgen path in these columns (the one you used earlier for 'CreatureModelData', but this time replace the 'WorgenFemale.mdx' with whatever the 'extra' textures may be, for example, the Tauren one is 'Character\Tauren\Female\TaurenFemaleSkin00_00_Extra_HD.blp').
