Sorry about the phlebotomy disaster. Why so upset about it, though? It's not like you're forever scarred or damaged by it. And like you said - you're a hard patient b/c of tiny veins and dehydration. Look at it this way, she was able to find blood and fill those vials when no one else was. Things like that happen. Not worth getting upset about.
I'm a regular blood donor and every 4th time or so I experience venal issues or phlebotomist issues. Coulda been worse - you could have bled all over the floor like one time I had while in the army. I volunteered my veins for combat lifesaver training and the guy who practiced on me was a paramedic in the non-army world. He put the needle and catheter into my arm, but wasn't quick enough with the tubing. I bled out through the catheter all over the floor - and then had to clean up the mess myself b/c he booked it out of the room. Once at the blood bank, the girl perforated my vein (she was in her 50's) and a huge bubble formed under my skin. She saw this and pulled the needle out. When she did this, blood started squirting out of my arm, all over the floor and even onto her glasses.
Digging hurts, but it's not worth getting that upset about. They can't see under the skin, so they have to go by feel and guess - and veins roll. Like I said - she was successful when no one else was.