First,condolences for the loss of your daughter. i thank you for her service. while i can certainly understand your feelings, the theater may not have been following proper etiquette in regards to the pledge. it is to be recited only in the presence of a flag.
I probably wouldn't have known this except my DB is a vetern and is very active as a member of an honor guard. He is a stickler for proper procedure when it comes to our flag, etc.