My PC is a fighter/thief/mage and I've completed Nalia's keep quest. She's offered me to lead her castle but I prefer the mage stronghold. The problem is if I rejected her offer she would leave the party. Is it possible to keep Nalia AND have an other stronghold ?
There is no way to refuse the offer and still have her in the party. If you have an earlier save, load that and go and do the mage's stronghold, then come back and finish the keep. That way, she won't offer the keep and will go with you.
Thanks for the advice, that's what I wanted to do. But I became very angry after I realized that my last saved game was before entering the keep. I'd like to have one with only TorGal's battle missing. I think there should be an option to refuse her offer after clearing the keep.
You can try removing her from the party before exiting the keep, that way she will not talk to you. Then go and do the Mage stronghold and pick her up again, she'll be in the Copper Coronet. I'm not too sure if this will work or not, make sure you save before doing it.
Not sure, nonetheless there was an opinion you may return to the matters any time you initiate a dialog with Nalie regardless she is in your party or not. There was a thread some time ago, you might consider to search.
Loredweller
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...for tomorrow never comes ...