Is it wrong of me that the first thing that popped into my head at that Giraffe line was a page from my own comic? "I go where I please, I'm like a gazelle that way." "You're nothing like a gazelle!" "I'm graceful like one." "Yeah, you're plenty graceful, when I push you off a cliff." "Hey! I'll have you know I fell off that cliff all on my own thank you very much." "How is that something to be proud of?!" "We all have our own values Samus." Sorry for the shameless quoting of my own work, I felt like sharing.
I thought a giraffe is the insult someone might use for someone tall. She's suggesting one of her problems is that she's at a height disadvantage, and that Tabitha can avoid it more easily with longer limbs.