On Billboard Hot 100? If you meant that, then maybe. She has competition though from Beyonce & Shakira who shot up from 94 - 3 in one week. I love Girlfriend and it would be good to see her reach #1, but over Beyonce & Shakira, then no.
No. Much like "Too Little, Too Late," had it's radio airplay been at the same time as the release of the digital downloads, then yes, but no, they released it before the song reached radio. The people who handle the timing of Fergie's singles do a better job with achieving peaks when they clog digital sales for a short period of time allowing radio airplay to catch up.
Maybe. Bee & Shakira have quite a lead. More radio impressions, more downloads, etc. Avril added single too early on downloads before it could really get big on radio. She should've waited until like late Feb. or early March to release "Girlfriend". That way she could let it grow throughout March, and then early April release to downloads. In result she'll have a bigger album debut. So hopefully she can get one week, but like Eddie said, the same happened to RTA. Difference RTA flopped on radio and Girlfriend has a +1350 bullet. So hopefully she makes it, but again I doubt.