Hey @IloveMYA ,
Thank you for sharing a little about your beautiful grand-daughter.
There sure are services for young people which are over the phone or chat-based which may help with her mental health. Although they can't diagnose her or prescribe medication, she may find comfort in sharing what's happening for her with other young people.
ReachOut has an online forum similar to this.
KidsHelpline is also a good start https://kidshelpline.com.au/
KidsHelpline Webchat https://kidshelpline.com.au/get-help/webchat-counselling
ReachOut have a specialised 1:1 Parent/Carer coaching service which may be useful for you to get some advice on how to better support her. https://parents.au.reachout.com/one-on-one-support
With ADHD and medication, can you ask her GP for telehealth appointments to see a specialist?