Parental Case - plz advise form IMM0008

[asidhu5]

I applied to sponsor my mom in Jan 2009. Received this latest letter on Nov 29,2011.

Everything is ready, just some questions:
a) on IMM0008 for Q.10, as my mom is visiting canada, I listed current country of residence as "Canada". Next it asks for "From" & "To". Now "From" is the date of entry. What should i write in "To" Field? Should i write date of signing the application or 6 months after entry. (My mom plans to stay 6 months but she can leave early; as things happen)

P.S - When my mom entered, her stamp doesnt have any date, so her entry is valid for 6 months( till 18 june,2012); even though her visa expires on march 14, 2012. Please confirm if i am right about that?