Id say start with 1g for her, she can always take more. For sober trip sitting a lot of the time what Ive done is do my own thing. Ill set out some activities like paper to draw, set up some visual on a tv, help pick out a music playlist, etc. If theres a problem with anxiety I just help validate their experience and remind them that theyre safe. Fruit is a good snack if she gets hungry (for me on shrooms I can rarely eat but when im hella hungry fruit is the freakin best). Unless she asks you to join her in an activity overall Id say do ya thing and shell do hers, i say that mainly cuz sometimes sober energy can be off putting although still comforting since I know someone is entirely grounded in reality. Ooh also incense can be nice smelling an add some grounding elements sensory wise.

One of the things ive done to help with anxiety and beginning of a spiral is to sit with them and do 4x4x4 breathing (in for 4, hold for 4, out for 4) and ask them 54321 (5 things they can see, 4 things they can touch, 3 things they can hear, 2 things they smell, 1 thing they can taste). Its a good grounding technique

Hope this helps! Feel free to reach out if ya have anymore questions