How to go about this?

Move on. There is only two things that could possibly going on here!

1. She really isn't interested or she truly needs time.

When a woman says she need time it is because she sort of likes you and you might due if she got no one else but trust me she will replace you sooner or later with someone who really does it for her.

Move one. Trust me.!

Putting myself in her shoes, chances are she just wants things to flow naturally (boyfriend probably doesn't have much to do with it). Just keep your word. Don't over do it, (calling/texting multiple times a day), or under do it (calling/texting once a week). Just let it all flow naturally. Don't press your feelings on her with words, more or less, show her how you feel, by your actions. She's not going to take you seriously unless your words and actions match.

Give her a little space like she says, but not like you think hang out with her AND her friends and or yours it takes the presser off of really trying to get in a relationship. WARNING: but don't do this frequently it will bother her and you'll be the talk of her table. oh and if she is alone do the same, but let her invite you to join her in a walk or whatever when she is alone.hope I helped!

Hmmm that's a hard one. I think she understands how you feel about here but when you are with someone or have feelings for someone that long it takes a while for those feelings to go away. I think she needs a bit of time to make sure she's over him to that she doesn't jump into something, have it get serious and then she's stuck with conflicting feelings. Give it a little time and see where things go. You'll have to make a decision from there to move onto someone else or keep at it. Good luck