as far as i know your supposed to get your police clearance certificates from each country that you have lived for more than 6months after your 18th birthday.
So yes she will need a police certificate from Holland.
I had to do the same for my police certificate from england, BUT did not use the forms provided in the CIC immigration forms.
I would suggest that you google it for holland and follow those instructions.
so after a quikc google search she will need a VOG, she can apply for one here:
but i cant read dutch soo... your on your own there ...lol
http://www.justitie.nl/onderwerpen/opsporing_en_handhaving/verklaring_omtrent_het_gedrag/index.aspx or review the following CIC link:
http://www.cic.gc.ca/english/inFORMation/security/police-cert/europe/netherlands.asp