My daugther is the exact same age 7/28/05 and has been transitioning well to the potty. Like the other moms are saying, take a couple weeks off and then put her on the potty when she wakes up in the morning, every morning until it becomes routine. Don't do it or talk about it any other time of the day. Then bump it up to morning and after naps until she is more used to it and motivated by being proud of herself for actually doing it occasionally and getting her reward. Our reward is a big smile, hugs and kisses and Yahoos!
Next thing, when you get her to sit down, I hold Abbey. I get on my knees wrap my arms around her waist and let her rest her head on my shoulders. Sometimes we rock a little side to side and sing "row row row your boat," (same song every time) or ask if she'd like to read a book.
The sleeping thing, ugh! We're going through the same thing. When she used to cry in her crib, we'd do the same routine every night, give her a kiss and hug and tell her I love her the same way every night and leave. She'd cry for 5 or 10 minutes and give up. Now she is crawling out of her crib so I'm trying to get her in a big bed. She gets out 3 or 4 times every night and I just talk to her sternly and keep putting her back, with less and less talk everytime, she eventually stops and falls asleep. Frustrating, I know, but it works. Consistency, even if it sucks for you for a week or two. Important: BOTH parents need to do the same thing. My husband ALWAYS gives in. I'm struggling with keeping the baby in bed and keeping my husband dowstairs!