Maybe you could serve as a Personal Concierge for American visitors, offering shopping, dining, site-seeing, touring, planning, etc. You could offer a flexible menu of services and prices, let your customers decide what they need.
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I like the "apartment research & advice" idea. That is a perplexing subject to me because all the photos look wonderful....

To those of you suggesting she do something that involves driving people around: a special license is required for this, as well as special insurance. It's not easy to obtain and as I understand it it's quite expensive.

She's not just going to be able to throw people into a car and take them places - at least not without incurring significant risk.

She asked for suggestions. It's up to Isabelisa to decide what's too expensive or risky. Not us.

I had the same idea as chevre. Organising dining tours and maybe daily meet ups for solo women would be awesome.

Even a guide must take a test and requires a license in Paris.

Not true. Some types of guide services are regulated; others are not. If all guides required licenses and tests in Paris, there would be no foreign tourist groups, since no foreign guide is going to take a test and get a license in every city he serves.

What is heavily regulated is money-handling travel services, which come under the heading of travel agents. Guides who provide such services also fall under these regulations. Some specific venues require special credentials for guides who wish to speak inside those venues. But overall there is no specific licensing scheme, in part for the reasons I've already described.

Chevre & Belldame have the right idea.
Eating alone (for me) is a bummer. On cruise shops, one can request a large
table & have company & discuss the next days plans & get input. This would be a great plus in Paris.

I like the idea of oraganizing dinners for solo travelers. I've been one myself and it's no fun to stare at the wall. Do you think it should be just for women or mixed? Thanks again for all of your suggestions.

http://www.meetingthefrench.com/index.php?lang=en

This is where you can be invited into a Parisian home for dinner.

Merci, Kerouac. I know about Jim Haynes
& this company.
However, I was thinking more along the
lines of mini-GTG's where folks could
meet at "Paris secret' restaurant, choose their own menu, pay individually
& query the hostess on whatever comes to mind.