H4 visa - travel to canada (amendment is in process)

[tech2012]

Hi

My spouse has valid H4 visa stamping till Sept 2018 and my H1b Amendment is in a process and She wants to go to Canada for 1 week - family visit and she has Canada visitor visa also. so Is it fine with her travel to canada ?

pls, suggest on this AND Does she have any problem while returning to USA (in Detroit port of entry - by land )

Thanks