Dependents travelling alone to UAE

Though I'm not sure this might be the right forum to ask this...May be someone ever got a situation like mine.

My wife (a house-wife) wants to travel alone to UAE next month. Will she get visa on arrival from airport?

We've been there many times but she used to travel with me. This time she'll be trvalling alone.

Any ideas?

(It's really hard to get the right guy on phone from UAE embassy.)

yes she can travel but she need a invitation from UAE

Many Thanks @wilson. The purpose is tourism and I'm not sure if I can get an invitation.

I think the safest approach would be to get the visa applied+stamped from their embassy in Riyadh before travelling.