Hi,
Going out on a limb here.
You do not say how long the twitch in the neck has been going on.
In medical astrology, there is no argument that the neck area is ruled by Taurus.
Twitches, uncontrolled movement, etc. is said to be ruled by Uranus, said to be the planet of sudden and unexpected yet necessary change towards independence in life.
Uranus first entered Taurus in May 2018, after completing its sojourn in Aries where, since March 2017, it had positively aspected the Pluto-Venus-Mercury stellium in Sagittarius, yet was in conflict with Saturn 3 times. Could this have coincided with the hormone changes in her body through approaching puberty, which she may not have understood and was not adequately explained to her as a natural growing process into womanhood? OR, did she understand it too well and Saturn authority curb its possible effects?
Once into Taurus .... a physical sign.... for good, the planet of change made a 'passive' aspect to itself, the independence of thought in puberty that every teenager goes through. Its next aspect was to Mars in May 2020. Mars in a (young) female chart often represents the power of attraction of/to the opposite sex versus the assertiveness of one's own strength of will. Could a situation have arisen through which the outcome affected her in such a way that it ultimated in the nervous twitch? An excuse rather than real reason for not wanting to go to school???? There is a difference between the meaning of a nod and a shake of the head, after all.
The planet of independent change is going to aspect her Mars yet again. Hopefully this will see a strength of will return and be regained in herself, so that she can enjoy the teenage years as every young adult should.
Out of interest has she grown up in a non-biological father/stepfather family setting?