Not meaning to encourage a debate or get TOO off topic but to be fair, aren't females (specifically breeding ones) less likely to climb than males since they don't have the need to roam the same way males do? Especially during breeding season?
Not saying they are arboreal of course, because I know they're not, but I think if presented with the option some do take the opportunity to try some modest climbing, but is heavily dependent on the individual bp. It could be that Little miss Mazikeen is an exception to the rule, but it probably helps that Starscream did a good job providing a secure climb set-up that she has no problem using it on her own, and possibly even when she gets older/weighs more.