Is Bottom the hardest lane to carry from?

I play duo queue with my girlfriend and we win our lane 9/10 times, but 8/10 times, our solo lanes are getting crushed, and we end up losing quite a lot of games due to that, because the enemy solo laners get simply too far ahead for us to do anything effective in a team fight. I know it also depends on the matchup and the champions we play. I've been playing Miss Fortune a lot lately and have been getting quite used to her, she usually plays Sona or something with hard CC. So is Bot lane the hardest to carry from if you get ahead?
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