Do you want her pigtails as thick as she has them? If so, you need to do that yourself..There aren't any wigs that thick..I would use an arda wig and clip ins.
In either Rose Pink or Baby Pink..And 4 matching clip on ponytails..I say 4 because if you want them that thick, you will need to splice 2 clip ons into one thick one so the 4 normal ones become 2 thick ones.
You could also go with epiccosplay
Any of their short wigs with slightly longer bangs should work, then do the same thing with the clip ons.