Tearing up the will does nothing. Your best bet is to find the old lawyer and do it with him. Another option would be to hire a new lawyer who if any good should also notify all parties and make a new will. Lastly I wouldn't recommend a European will because this might lead to a messy legal battle in the future on Thai soil assuming the assets are in Thailand.
Well many of them have no insurance. So she most likely will have to pay for her stay. What did the police say? Did they take your motorbike? There is a chance they make you the guilty one and in that case you (or your insurance) will have to pay for her. You have to clarify her claim and then it's up to the police.
Go to Pattaya, Bangkok bank on soi bukhao. Queue up for the young guy he can do it. You will get a debit card + passbook. Costs about 7500 baht with "mandatory" insurance. Bangkok has no options at the moment as far as i know.