It's hard to guess, which with the amount of detail we have guessing is what anyone on the internet would be doing. But if your intention is to gain weight, & you aren't gaining weight, then the answer is you're likely not eating enough. (assuming you are very lean already, if you've got some fat to lose that's a different story) Ideally you'd add in calories slowly, while making sure you're getting adequate protein.
I don't compete in physique competitions, but I do compete in a weight class sport. I must say adding 5-7lbs of quality muscle is going to take a long time, especially for a woman. Much longer than seven weeks, more like 7 months optimistically. Now, I'm not saying you won't add more mass than that, but if your talking stage muscle then it's going to be a long, but rewarding road.
I am by no means an expert, but when my fiancee competed the idea was to add a little muscle in key places until a couple of months out, then focus on preserving that muscle while she cut as much fat as she could in the time frame she had.