Welcome to the forum! Halo is very gorgeous!!! 🥰. I would say that Halo has bald patches on her since she is most likely going through her first molt. Cockatiels go through their first molt between 6 to 12 months old usually which Halo fits between. I would still keep an eye on her and make sure she is not losing all her feathers at once in just one spot because then there is probably an issue. I'll insert a link for you to see about molting just to keep Halo comfortable since molting can be a very stressful time for them.
Cockatiels Molting, Preening, Feathers, what is molting, what is preening, how often do cockatiels molt, when do cockatiels molt, how often does a cockatiel molt, pet birds and molting, different types of bird feathers
Cockatiels Molting, Preening, Feathers, what is molting, what is preening, how often do cockatiels molt, when do cockatiels molt, how often does a cockatiel molt, pet birds and molting, different types of bird feathers
