farming pre-6 is really hard with anivias low damage, after 6 just put your ulti on an entire wave,dont be afraid to tank minions to make them stay in your ult, E the siege minion and cash in.

after lvl 6 its easy to drive-by eat the raptor camp, and you can solo bluebuff without taking any damage if you wall him into his corner (dont go for blue if youre out of mana, basic attacks are useless).