That's a good point, but it's a terrible line even coming from Ashley/Garrus. When the third party member talks about Talon Five ripping up the Reapers, that sounded like soldier chatter (James asking if that pilot has a boyfriend, Kaidan and Garrus talk about getting her drinks). But after that? Liara's just whining about the asari.
Funny thing is, all this stuff, here and elsewhere? Proves Ashley's racism comments from the first game.
This line, and the "The Major/Lieutenant Commader has gotten very capable", just reeked of OOC-ness. The first one for inappropriate gallows humor, the second for a smug sense of superiority
Oh, you so do NOT want to get me started on that 'become quite capable' line... (Too late.)
For one, Ashley/Kaidan were (at least potentially) there to take down several geth and a krogan battlemaster while she stayed out of combat. Yeah, yeah, you can get in to the matter of how long she was in that prothean bubble, it's still a case where part of her first impression of Ashley/Kaidan is of them going into combat against a force of superior numbers and even potentially strength (since battlemasters are considered heavy lifters when it comes to krogan going in to combat).
For two, it's the writing propping up Liara at the expense of Ashley/Kaidan - if you're a newcomer to the series, that line gives the impression that Liara has seen and done far more at Shepard's side than Ashley/Kaidan, that they were some fresh-faced newbie the first time they worked with Shepard and have since grown. Kaidan earned a place on the Normandy, the state-of-the-art prototype warship, on his own prior to things going down with Saren, and Anderson picked Ashley out of her string of crap assignments given to her because of her family name and history, rather than a reflection of her abilities. Both of them were PLENTY 'capable' when they first met Shepard or Liara. If anyone's 'become' quite capable in this situation, it's absolutely Liara.
And for three, this is another line that does not sound like Liara, because those two are supposed to be people who she at least considers herself friendly with - neither of them ever mistreated her or insulted her. At most, Ashley had justifiable concerns about her, as she was the daughter of one of Saren's allies, but even then, every interaction between them and Liara in the first game are friendly at best, cordial at worst.
In my book, that line should have been something to the effect of 'Ashley/Kaidan seem to be holding up well, considering what's happened to Earth.' Maybe even a reference to how she'd react if it were Thessia instead of Earth, give some foreshadowing and show her being empathetic towards people who are supposedly her friends.