With your height and curvy body, you sure can carry the 35. Follow your instinct.
I don't think the 35 looks like luggage at all. I am 5'10" though. I think you will be fine. I don't carry a lot as well and it doesn't have my shaper in at the moment....just a few black Friday coupons (the long length ones)
I am 5'4" and have the mono speedy 35. It is a fabulous size. I don't think it looks like luggage at all. I use to take all my essentials to work and have room to carry my heels to wear in the office. It is a good size for travel since it will hold all of yoyr purse essentials and also stuff you might want on the flight such as scarf/shawl, magazines, kindle, bottled water, etc.
Personally unless you carry half your house with you i think a 30 is big enough.
A few years ago I felt the 35 was too big but now I think the 30 seems small! I have mostly 35's and find them very roomy - not overly huge at all. I like the bigger opening and ease of getting my things in and out. I'm 5'6" -just a little taller than you are so I think the bag will look great on you.