Anyone get denied for a new MBNA card application? It's because of applying for too many cards via your credit report/score.

Odd thing is I got the Alaska card, my wife got denied. She makes way more than I do, she got the CIBC Aerobiz last week, a basic Amex Aeroplan card 2 months ago and cancelled 2 Amex cards last week (another mistake?).
Oddly her SPG application required proof of income, applied the day before the MBNA app (mistake in timing?)

I got a biz SPG 2 weeks ago, basic Amex 2 months ago and the Alaska card last week. I cancelled the personal Amex gold card 2 months ago.

I'm wondering when can she reapply if at all? This is totally new territory to me.