How do you farm with Leblanc

I've seen some high challengers play Leblanc and I'm really surprised to see people with 100cs in 10 minutes. Like I can't even get 70! I can get around 85cs in 10 minutes playing ADC but when it comes to mid lane ap champions like Leblanc I fail miserably. She has a very low base attack damage, 50+ I believe, which is why it's a lot harder. It's impossible for me to farm with this champion. Should I run a few AD runes? How do I make this easier. She's pretty mana costly early game too. I usually rush morellos. So it's hard using abilities on cs and poking enemies at the same time.
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