Approaching this chart as a medical and not a regular one...no she's not, cause venus which signifies not only her body but also her head is not afflicted in a way that could be descriptive of a mental illness..this debilitated Mercury(retrograde and temperamentally unbalanced in scorpio) as accidental significator of her turned 2nd and though as a natural sig for communication, nerves function etc.. should have been prominent afflicting her first -head and not in her turned 7th(if i see the cusp degrees correct ), so she might have disorders related to other parts of her body, which cause her stress but not mental illness for sure.Mayby there is a humoral imbalance since according to saunders venus is a cold and wet planet placed in a hot and dry sign..according to others venus is presented as a hot and moist planet so either way we have an excess of hot and dryness, fiery and that stands also for her dispositor Jupiter in sag.
Approaching this as a regular chart, then we could say that her third communication -online through social media- simply harms her, since moon in virgo in venus term and fall..and mercury again retrograde, mute, peregrine and still under the beams
to sum up...no i don't think she is mentally unstable and also it seems to me a bit cruel to characterize someone as being mentally ill...just because his online communication seems veird ..if that was the case then everyone nowdays easily could be characterised as mentally unstable,just by seeing various threads on fb or else