hello Carly
firstly, you are doing a really great job of taming your hamster. Each hamster has their own personality and depending on where you got her, a rescue, pet shop hamster will make a huge difference to how long they take to tame. A lot of the time they are not handled a lot if they have had a bad start, this makes a huge difference. Please be patient and keep doing what you are doing.
keep talking to her, so she recognises your voice, make sure her cage is somewhere quiet and away from sunlight, draughts and where people walk past often, ie by a door.
the more you handle her the better she will become, honestly she really will get better, and the fact that you can pick her up and she comes to you is really great, you are doing everything right, she is lucky to have you!. Also the fact that she shredded up the tissue is a good sign, that's what they do to make their beds!.
Also don't forget that their cage is their territory, it is quite normal for them to run away if you put your hand in. I have had my rescue hamster for 10 months, she was 4 months when I got her, and she still runs away from me when I put my hand in her cage!!, she is a cheeky little thing, but with lots of patience, treats, lots of out of the cage play time with you will really help. it really is a great feeling when these little hammies start to respond and trust you, by the sound of it she does already, well done.
hope this helps!