Hi Yasmin. You won't always want to do everybody, but you just get on with it.
The linking you are talking about: You need to fiddle around and make sure you are on the right spot. You will know when you are as you will 'feel' it quite strongly and also she should shut up! Place your thumb on one hand over the pad of the large toe and with the other hand drop down from the ankle bone on to L5, apply a bit of pressure until you feel the little bone there. Move around slightly until you feel the connection. Once you have it you will know it, but you need to search for it on different people.
Try an oil to shut her up! I think off the top of my head Cypress is for talkative people and that has worked too. Or you could really knock her out with Clary Sage mixed with Marjoram and lavender, maybe a drop more than usual?
The other things to do are:
Tell her to shut up! Seriously. When you start the treatment, say something like "please don't feel you need to talk to me when I treat you, the best way to relax is to close your eyes and not talk at all." She will probably tell you she likes talking to you! But you have made your point and then I would not answer back when she talks, just give a nod, an 'um' and an 'oh'. etc.
Thing is though, she is paying you for the treatment and at the end of the day if she needs to talk then let her.
Good luck!