You can tactfully tell her that weekly hang outs just aren’t possible. Suggest to see her in few weeks and make interactions less lengthy. You can maintain friendship with less frequent interactions. Also suggest doing something together rather than just sitting on a coach.

I also think it’s ok to do some white lies if you don’t want to hurt her. Tell her you are busy and will see her next week or whenever you want to see her. You don’t need to be always free for her