You see. It doesn't make sense for a British women to be on the front lines period. There were cases of women fighting on the front lines during WWII (Night Witches, Lyudmila Pavlichenko, Finland Defense force). If the trailer was a battle between Late Russia and the Germans than yes, a couple women here and there wouldn't be out of the ordinary. The fact that there's a British Women, a CRIPPLED British Women, on the front lines is just a big forget you to history. You can argue that this is just fiction but its clear that more than half of the people who keep up with Dice and the Battlefield Franchise were really looking forward to an authentic and immersive WWII experience akin to the glory days of video games ala Battlefield 1942, Medal of Honor, CoD 1+2 etc.
This feels more like a Bad Company game set in WWII, and if it was aptly titled "Battlefield Bad Company: WWII" or something along the lines of that. I wouldn't have an issue with a British Women in a squad because we know the Bad Company games weren't meant to be realistic in the first place.