The early reports and statements (as opposed to the ones on the stand) are usually viewed as most honest and telling because they are often made before a witness has a chance to lie, fabricate, or be swayed. As such, if Dawn Holland lies, those early reports will come in to impeach her and to corroborate the true version of the facts.
There is only one answer that makes sense and it's not really news. The reality is that Lindsay Lohan is an addict. Addicts are desperate and will do desperate things, including battering someone to cover up their use and abuse. The only thing that remains to be seen is can Lindsay Lohan get out of her own way, help herself and get some control over her terrible addiction and demons?