I wouldn't worry at all about "flowering too slow" ... remember, this is an auto and will simply do things on their own schedule unlike photos... I happen to think things look really, REALLY good for week 7! Just keep treating her to your bloom nutes and you'll be surprised at how she does.
Remember, you're not growing cookie-cutter plants ... each strain is different, sometimes each SEED is different, particularly when you're growing autos. I have three Glueberry autos going now - one of them is a nice, bushy monster, one of them is kind of spindly and one of them is a shade of lime green that won't change no matter what I do for her - but she's growing well! And I've treated them all exactly alike (well, except for Ms. Lime Green but she's a case unto herself!).
Relax, listen to your plants and enjoy the grow... you're doing fabulously!