Hi, It must be distressing for you.I can appreciate you are being proactive to offer your help to Allie.
We need to look in to the Diagnosis first. It is very important because the treatment options depends on the diagnosis and also the prognosis and what you can expect from the treatment also depends on the correct diagnosis.
Before proceeding further I just want to clarify, the following answer is based on the information provided and she should have a face to face Consultation with a Psychiatrist for confirmation of the diagnosis and drafting of the manageent options. From the symptoms you mentioned I can think of three possible diagnostic options.
1.Borderline personality disorder
--Impulsive type (associated depressive symptoms,repeated OD)
2. Mixed anxiety depressive disorder
with co morbid personality traits and alcohol misuse
3. Primary alcohol problems with comorbid mixed anxiety Depression.
Although the above diagnoses appears some what similar the approach to treatment and prognosis is very different.
If the the diagnosis is Personality disorder the main Tranent wiu,d be psychological therapy Mainly a therapy called Dialectic behavioural therapy. This can be done as an outpatient in the community or inpatient. If necessary in few patients medications are also required.
If the main diagnosis is mixed anxiety depression, it is important to look in tot he treatments she received and try different medications with different mechanisms of action( for example if SSRI are already tried then to consider SNRI or other antidepressants which can effect anxiety as well..for example Wellbutrin).
If the primary diagnosis is alcohol related problems, the aim should be to address them.From your post I noted Allie usually took OD following an episode of alcohol.We do know that alcohol helps to reduce the rational thinking behaviour.
Now coming to the option of whether you can commit her to an faith for therapy, it depends on her functioning and mainly risk to herself and others. I am aware how frustrating it can be for parents but according tot he law the decision can be taken away from the patients hands if the risk to themselves or others is severe.
You can look in to the possible triggers for her behaviour. We do now that in most of the occasions the self harming behaviour would be the result of interpersonal relationship problems.
You can also advice her to keep a mood diary to identify any mood disturbances.
I hope you find the answer helpful. I wish Allie and you all the best.