Wibu to buy dd a new pushchair(dolls)

[DizzyDancer]

My nan for Christmas (dd's great nan) bought dd for Christmas a silver cross ranger dolls pram and kitted it out with knitted blankets and everything.
However it's just so big for dd and she struggles to turn it. She had a bit of a paddy today shouting "it's too big!"
Her birthday is at the end of March and I think she would love to mamas and papas armadillo buggy as the wheels turn.
Problem is I really don't want to upset or offend my nan and I can't even tell her that the buggy is no good.
Would you buy the armadillo and explain and let my nan lick her wounds or would you try and get dd get used to her silver cross?

My 4yo dd got the ranger for Christmas too, it's the right size for her but she is very tall, in 5-6 clothing. Her 2.5yo brothers (also tall!) like to try and push it but without much success, so I can see how it can be frustrating for your dd.
My boys have this from toys r us. Ignore the review, it's complaining about the size. It's a very sturdy buggy and definitely preferred over the umbrella fold stroller we started with when dd was 1.