@EA_MakoIndeed, stretching is important but if she keeps doing that so many times she will need a medical examination to see if she has undiscovered medical issues.
I never though she was so much against aliens (as she loves Tali) and is only wary of: Wrex (if he decided to take the ship it would be a massacre), Liara (Benezia daughter) and Garrus (First Contact War feels). I actually love how she is one of the most humane character and is representative of how humanity reacts to the aliens after only almost 30 years forming part of the galactic community: there is still mistrust (specially since they meet aliens who attacked them without declaration) from humanity to aliens and vice versa but because the player base is so enamored with the aliens we only see the faults of humanity and apply our own morality (I understand the: "I can't distinguish aliens from animals" was supposed to play near the Keepers but even humanity are animals themselves).
Williams also was kept from any military posting where she could have been working with other aliens so that meant her doubts never evolved up to this mission , and that is assuming Shepard allows to recruit the three aliens (Liara is a must and yes, apparently there are people who don't recruit: Tali, Wrex or Garrus), because the Brass was still punishing the Williams.
There are a few videos in my Mass Effect playlist from ME1 and ME3 that show her for who she is heck in ME3 she mentions she is worried and concerned of the Primarch son and after the Turian Bomb mission she has a wonderful conversation with Tali (you need to complete those two missions after Rannoch and you can get some banter from Ashley to another person, which due to a conversation that isn't triggering but modders restored we can see she has a talk with Liara after the Coup making me suspect there are more triggers that since the Legacy version aren't working).