new baby..
Congrats on the snake dear! she is very cute, and does look like an amelenistic corn, which is a snake that has no black coloring. check out the photo section and maybe you'll be able to figure it out looking at other people's pics of amelenistics

you seem to be a great parent so far! i can tell you care a lot about your snake. good job finding answers here, it's very nice to see new parents being informed about their babies! As someone already metioned, if you have the money, definatly get The Corn Snake Manual by Kathy Love. It's an awesome book, it has helped me soo much! Even browsing around these forums is helpful since alot of people ask the same questions, you can usually find answers to your questions too.
You said you're going to try and take her to the vet, right? when you do, sometimes the vet may be able to tell the difference between males and females. One way i heard was to hold her tail up to a light to see through the skin, and usually you can see dark spots behind her vent (where she poops from) if it's a male-the dark spots are the inverted gentilia. And when she gets bigger, the males have longer tails that taper more. check out the photo gallery and there may be pics of male vs. female tails.
As for size, most males get about five feet, and females are a little shorter. some snakes get up to six feet but that's unusual. the larger snakes can eat a medium sized rat or two large mice every two weeks or so (someone can check me on this, i'm not sure how often you feed larger corns)
If you feed your snake more often she'll probably get big faster, but you don't want to overfeed her because it can be unhealthy. Again, check out the corn manual book becuase that is the best advice i can give you! i'm a bit of a begginer as well, but i learned so much from that book and it's so worth the money! I've answered many questions reading through it once or twice
here's a link, they are probably about 10 bucks with shipping..
http://half.ebay.com/cat/buy/prod.cgi?cpid=5009210&domain_id=1856&meta_id=1
<<as a personal request, it is kind of hard for me to read your posts, if you could space things out a little more and have more punctutation, it would help very much and i could read your posts so much faster. i'm not trying to insult you or anything, i just have a really bad eyes and it can be difficult to interpret the posts! thank you!>>
From what you've posted slinky sounds just fine well, i hope this answers some questions, and thank you again for being concerned about your little slinky! Good luck to you both and try not to worry too much, i'm sure you'll do just fine!!
~jessi