Hi there and welcome to the forums!
You have certainly come to the right place as you will find all you need to know on budgie care here.
I'm sorry you are having problems with your Skyla.
When did you notice this change on her behaviour? Did this biting happen gradually or was it out of the blue? Were there any changes on her environment recently? How old is Skyla?
It's true that in certain situations, budgies can be more moody and express their disapproval by biting. They can do so when they do not wish to have a closer interaction with us, when they are scared and feel threatened and when their safe boundaries aren't being respected.
Budgies can be more sensitive and resort to biting when moulting and also as they are coming into breeding condition.
Do you happen to have a mirror or mirrored toys on the cage?
Mirrors can cause a lot of problems in the long run, especially when budgies develop an unhealthy attachment to them and lose interest on having a closer interaction and bond with us. In many cases the attachment to the mirror and the over protection the budgie has over the "friend" on the mirror would lead to a more dominant and territorial behaviour and this will translate into hard biting.
You will find valuable information here at the Taming and Bonding section and the information and tips on how to form a better bond with your Skyla will be extremely useful. Be sure to check the sticky threads at the top part of this forum.
You can start by checking these two links:
And about your Skyla's gender, if you post a picture taken in natural lighting showing the whole beak/cere area, we will be able to tell if she's a female or not.
Best of luck with Skyla!