Thought I would post this here rather than in the teachers section as it may get a better response from the strings section rather than general teaching advice!
I have a student (inherited) who has been struggling to get to grips with vibrato for several months now. She is a classic worrier and likes to overthink every possible musical situation. She was unaware of vibrato when she came to me despite having passed Grade 4 and now we need to get it sorted relatively quickly so that she can move forward with a warmer tone and continue on towards Grade 5 which is now on the horizon. We are currently building repertoire around that grade and she would probably be ready to take the exam in session C if it were not for the vibrato issue.
She's very musical, now has good technique, plays with excellent intonation and rhythm and is keen to get it (vibrato) right but can't seem to do anything other than get her hand to move sideways - and even that takes several minutes of thinking about and isn't on a string of notes but just one slow down bow.
The approach I've taken is the "bouncing ball, waggling (not the best way of describing it, but you get the idea!) hand in the air, waggling hand along the violin, anchoring thumb and continuing to waggle and then putting any finger down and continuing the movement". She's good at this up to the anchoring stage and then it all goes to pot.
Does anyone have any other suggestions of how to teach vibrato - or how you learnt / are learning it? I've not had anyone not be able to do a reasonable job using the above technique before and I'm at a bit of a loss as to what to do next.
Any advice would be much appreciated.