Unless you are her clinician, you are in no position to decide which behaviours are due to autism and which are due to co-morbidly occurring MH issues, are you?
Her inability to remember to eat, to remember to shop for food, to regulate her sleep and mood are all typical autism and ADHD issues? You are assuming, as many of the attached articles above highlight people do, that she has MH issues (EuPD, Bipolar). You are labelling them as ‘MH’ issues when they may simply have been the result of un/late diagnosed, unregulated, unsupported and unmedicated ASD/ADHD - which is, in fact, what they were. This is why women and girls have for decades, possibly centuries, been labelled mad/neurotic/bipolar… because their ASD/ADHD has been dismissed by people like you - who really should now better in 2025.
Now she has been diagnosed in the last year, has counselling, accepts she will need medication for the rest of her life, her autism and ADHD has become more manageable. Completing a course, going to university (but possibly living at home or within reach of home) are possible.
Had she been given an ECHP back in secondary school, had CAMHS agreed to have her assessed rather than leave her languishing on the waiting list for 5 years and shoving ineffective anti-depressants/anti-psychotic drugs down her (because she was not depressed or psychotic, she was in distress due to her undiagnosed ASD/ADHD), then she might have had timely access to the therapy, support and the right medication a decade earlier. But, no, feel free to simply dismiss her as mentally ill rather than autistic with needs that were poorly met by a broken system. Shameful.