My "baby" has been regularly poked and prodded from the young age of 6 months old (heart condition--lots of tests/hospital stays/surgery). He never used to cry or get upset at all--he just now started crying out after the 3rd or 4th stick in one session--and he's 5. So this behavior isn't completely unique, and it can change, in my experience. I found that I shouldn't compare my child to "normal" children--it's not "normal" to have so many health issues at his young age, so how can I expect him to act "normally"? (My older child has always screamed and tried to fight the nurse for regular vaccinations. His younger brother, though, has told him since he was 2, "it's okay . . . I'll go first". What is 1 or 2 sticks in comparison to receiving and sitting with several IVs and hep-locks for days?) So I don't think you need to be overly concerned at this point . . . it's not like your child is a teen and getting pleasure from cutting herself or anything . . . she's observing adults--professionals--taking an interest in her and encourage her cooperation, and she is having a positive reaction, no matter the momentary discomfort. I think she's fine . . . Just be prepared if/when the floodgates break and it's just too much all of a sudden (that has been some of our more recent experiences--the "it's not fair", "why me", "I don't want to do this anymore" on occasion.)
Sending prayers and pixie dust!