1- No 3 seconds isn't much time unless she's built purely to be ultra sticky, and it's easy to negate, and she's lost the scrouge if she's hit you with the slow. If she hits you with the slow, look down.
And Brawlers/Weakening aren't to shut down her DPS, they're to shut down her 3 attack heal.
2-Greater Sprint only counters Weakening Curse's movement speed debuff, unless she's packing Fatalis she's wont have the sticking power once you bring out Greater Sprint, in which case she's also having to counter build and at this point, you need to learn to be careful. Ideas include not going out alone and learning to use your towers in your favour.
3- It sounds like you don't know how to poke. If she begins moving forward, aim for where she's going to be, launch, back off. Most pokes have a minimum range of 55, the outer limit of her dash is 55 and she'll then need to catch up to you as there's still distance between you
4- A god, why are you asking? Dash initiation is short range and easy to prepare for, block only helps with non-ability damage which wont be all of it [and first few seconds, no, it'll be shut down within a second with massed fire], and your situation is a two if statement chosing favourable situations, you haven't given a if line doesn't break.
Much of the game depends on relative player skill, yesterday I lost two games total of 8ish [With one being with a self professed newbie.], and the Bellona on my team when present always sucked balls.
5-Really? I'll have to check that, I never saw it activate when attacking towers/pheonix/etc.
6- Yes it was, you can't camp her, so to check that we put her in the role of jungler.
Yes, 2 and 3 give her excellent jungle clear, heck, just her 2 does... They also burn through her mana like a fire given access to pure oxygen, and given camp distances she'll often need to refresh abilities between camps. This allows for you to wait a little and gank her once her mana's down, unless she's stolen the mana camp from a rather unimpressed mage who'll now be loosing his lane.
I don't need to back down until I die... Makes attrition warfare much more onesided.
High Mana/Health regen FTW!
I'm sorry, but my lane clears weren't nerfed. Minion Charge!