PLL jenna and emily

I was reading another blog about how Emily might be "A". Of course there is some questionable proof and she probably isn't since she is one of the pretty little liars. But, it did get me thinking durning last nights epsiode. When Jenna said to Emily "Be careful who you spend your time with" could be taken sevral different ways. The most obvious and most likely being Pagie. The epsiode made her look really guilty. If Jenna is talking about Pagie, then Ali isn't the only person that Pagie fought with. Jenna could also be refering to the other pretty little liars. When Emily brought up what her friends told her about Pagie and Ali, Pagie said that they should talk to her and that Emily should trust them. Maybe Jenna and Pagie were close. If Pagie was telling the truth about being so upset by Ali teasing her. They both were bullied by Ali, so they could've teamed up. But, that would mean that Pagie was lieing about being alone. And finally, Jenna could be talking about Emily being 'A'. Asumming that the other blog is right about the Emily is A therory. Jenna could be warning her not to get caught as "A" or warning her that being "A" will get her in a lot of trouble. But if Emily is A then the new question would be how does Jenna know?