Irene Aebi, can you come out tonight?

We've got a few albums in the pipeline which have "Irene Aebi" on them. However, her name is causing problems.

We've already established that it's actually "Irène Aebi" - most sites miss out the initial accent.

... but
[www.justjazz.net.nz] http://www.justjazz.net.nz/albums.php?cat=L
reckons on "Irene Aëbi".

Now I'm woefully confused. There are over 60k hits for "Irene Aebi" on the web, but very few of those seem to have either the accent or the diaeresis - but they can't have come from nowhere.

Has anyone any inside info into exactly how the letters in her name are configured?

The album covers say this:

Irène Aebi:
[senators.free.fr] http://senators.free.fr/Listen/Covers/large_Covers/lp/Tips.JPG

Irene Aebi:
[www.altrisuoni.org] http://www.altrisuoni.org/recensioni/aebi/aebi.jpg
[images-eu.amazon.com] http://images-eu.amazon.com/images/P/B000042OSL.01.LZZZZZZZ.jpg
[www.squidco.com] http://www.squidco.com/miva/graphics/products/misc2/lacyPacket.jpg

... we leave her in the db as Irène Aebi but amend as necessary to Irene Aebi if she can be proved to appear as such on an album cover? That suits. Thx.