Letting your dog sleep with you doesn't necessarily mean automatic behavioual problems, but it is how you handle it. You have to claim the bed as yours, and she has to be invited to come up. Since she is so young, she really hasn't developed her personality yet though, so you need to be careful.
What would likely be best to get her used to her crate, is bring her into bed with you for a while before you go to sleep. After a little time has passed, you can take her down and entice her into her crate with a little bedtime snack (treat) and/or a favourite toy. Praise her, but don't get excited. It's best really not to talk at all, except for saying something like "It's bedtime." When she gets a bit older and knows "bedtime" means go to her crate, you can probably let her sleep with you for a little longer, as long as she understand when you say the command, she gets down and goes to her crate.
She actually shouldn't have really been taken from her mother until at least 8 wks., but you have her now. She is likely to be missing her pack, and will be a bit lonely for awhile, so I understand why you would want her in bed with you, but just make sure as she gets older that she doesn't take over.
I taught my dog this way, although I didn't use a crate, she likes her doggie bed. When I go to bed, I invite her up and we have some cuddle time. Then as soon as she sees that I'm drifting off, she jumps down and goes to her bed. It really wasn't too hard to teach her at all, so I hope it goes the same for you.
As for getting her a dog walker, I definitely would do that. Even if you have a neighbour or a friend that has a little time when you're gone, until you get home to walk her.
Best of luck with little Lyla!
