Why does my horse buckle her foot under her when I pick her hoof

Question 1)

She's 3. She was probably started a little earlier than she should have been because the people I got her from thought she was about 6 months younger than she was until I tracked her records down. She's a spotted draft and she's awesome! She learns very easily and she is really good unless I fail to work her like I should. She has been great about having her hooves picked for about 6 months and lately when I go to pick the first one she kindof buckles her foot under like she's going to go down on her knee. She does it slowly. It's almost like she's beginning to rely on me to hold it up...to hold her up. Do I just need to be firm w/her about holding it herself? Should I be alarmed?

Question 2) Maybe I'm asking these in backward order but she also seems to be a little clumsy. At first I thought it was just her age and growing into those gigantic feet and all of that. I still kindof feel that way. She turned 3 in May. Does that sound about right?

Spotted drafts do grow slow as do all drafts and draft crosses. It is hard for something that is so much a baby and has so little coordination anyways to deal with holding up their heavy legs and not being clumsy. You are right in the clumsy thing, our draft crosses we do not start until they are 3 and at walking only because of that. We dont start trotting them until they are at least 4 years old. They just dont have the balance or coordination. I would rather take it slow than have an accident.