I am glad you had a good visit with the vet today. My Sammy was just a little younger than Ivy when I got him. I still remember the first time he perched on a perch, he didn't grab on well enough and slowly toppled frontward until he was beak down on the cage bottom. When Sammy was learning to perch on the finger I started by placing him on a table or counter and having him walk over to my finger that was placed on the counter. He'd step onto it and I'd slowly raise it. I'd give him some love and praise, place him back down and repeat, a while making sure I said "Step up" when he was getting on my finger. Eventually he put it together that getting on my finger not only brought him to new places and snuggles, it was a high up place - far away from the scary floor.
Ivy makes Sam sound like a quaker giant. Sammy weighs about 140 grams, lol. And he's not overweight, he is on the bigger side of quakers. But that's because he is mature as well, when he was Ivy's age he was a little lighter.
Ivy sounds like a little cutie! I am a sucker for baby quakers, so if you have pictures, please post!