a few questions on my new rat

Question
I just got a baby girl rat named Beatrice.  I play with her everyday for at least
10 minutes but she always poops and pees on me.  I have read that it is
normal considering I have only had her a week but I wanted to make sure.  
She tends to scratch her nose a lot and clean herself and I was wondering if it
was normal?  She also sleeps a lot during the day and when I put my hand in
the tank to play with her she doesn't really come out.  I have tried offering her
treats to come out but she takes them and runs back into the home.  So to
play with her I have to go and move her house and pick her up, is this normal
for her age?  Also I was wondering why she was having labored breathing.  It
never really happens often, just a few times but a lot today...maybe because I
have been playing with her a lot?  And my last question is that I was thinking
about getting her a friend, I didnt get two at the beginning because I wanted
to make sure I could take care of one first, but I only am able to get a 10
gallon tank for now.  Since they are babies still will this be okay until they get
older and I am able to get them a bigger cage?
Thanks,
Daryn

Answer
1) Yes, its normal for now. She should grow out of it as she gets more used to you.
2) Also normal (for her to clean a lot).
3) If you just got her, its normal for her to be timid. Work on socializing.
4) NOT normal. If she's having labored breathing at all, its time to see a vet.
5) Yes, she needs a friend, but a 10 gallon aquarium is hardly big enough for one rat, let alone two. So its a hard call. She really needs a friend, but they also will need a bigger cage.