One just vanished, yet the ghost still haunts, but her color has changed.

Mootilda's hood checker program may fix it for you. http://www.modthesims.info/download.php?t=456523

It has fixed it for me in the past.

Ooooooh, thank you.

Hm, did not work. u.u

Then you need to use the testingcheats, teleporter, and batbox. I don't think two items counts as "a bunch."

In neighborhood view, start testingcheats (boolprop testingcheatsenabled true)
batbox (http://www.moreawesomethanyou.com/s...php?topic=72.0), teleporter suitable for your game configuration - in your case, AL, so the cat at the top (http://www.drealm.info/simlogical/s...Teleporters.htm)
Summon dead sim with cat
Shift click, make selectable
Select
Shift click batbox
Item
Respawn tombstone

It's a pain when you've got a lot of tombstones; and if the disappeared tombstones are in an uncleaned Maxis neighborhood (such as Olive's) it can't get the ones with no character data, but this is the state of the art. And the batbox and teleporter are massively useful, anyway.

Are both downloads 100% safe? I normally only download from MTS....

Yes both are safe to use.

It is possible to use both stupidly and mess up your game - which is why there's all that scary verbiage attached to the batbox's download - but if you don't use an option you don't understand, they're not only safe, they're potential game-savers.