My wife is filing tax for the first time. She cannot Efile. I was offer to print and mail. But it contains only 4 pages. Is that good enough?

When you print your return to mail it to CRA, not all your forms are printed. Instead, they're “condensed” into barcodes. This allows CRA to process your return faster and with greater accuracy.

https://turbotax.community.intuit.ca/replies/2647717