Most Helpful Girl
Okay, I could be entirely wrong about it, but here's what I think...
I'd say that she's definitely interested, or she wouldn't have said yes in the first place. If she didn't want to come, she would have made up some excuse or changed her mind and backed out.
She is probably bringing her friend along because she's a bit shy or nervous, and not sure how she should act around you, or what you expect of her. Bringing along her friend eases the pressure on herself (even though it may increase it on you).
One thing that would probably give you bonus points would be if you offered to buy both their tickets, or both of their popcorns. I wouldn't offer to buy tickets AND popcorn, as then it'd give the impression that you'd be happy to completely pay for both of them again, and then her friend might end up tagging along on future dates...
If all goes well for you, and you're still interested at the end of the movie (or at the end of whatever you guys do afterwards), and if you think she's interested in you too, try to get her aside and tell her you had fun, and suggest maybe the two of you doing this again alone next time. By suggesting that you two see another movie will mean that she knows how to act alone around you in this setting, so she shouldn't feel the need to bring along her friend again.
To tell if she's interested, aside from the obvious signs a girl is flirting with you, see how her friend acts. Like, if her friend makes sure that the girl sits or stands next to you most of the time, then she's definitely interested, as chances are she will have told the friend how she feels, and the friend will try to pair you guys up a bit. If the friend doesn't do this, she may still be interested though, and her friend just isn't making a big deal about it.
Sorry this is so long, I hope it helps though! Good luck!
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Most Helpful Guy
You could invite one of your friends along as it would make it less awkward. And it would also mean that if you were talking to her, her friend would have someone to talk to and not feel alone. And as for paying for her ticket you could ask her before hand, saying you would like to do it. That way you'll known if she'd appreciate it and could work in your favour. Hope that helped.