Where can I find Anna, the Baron's wife?

I'm stuck during the second part of the quest "Family Matters". I've found the Baron's daughter, but I can't find any more leads to find his wife.
The quest descriptions isn't really helpful in this case, it just says "Investigate all remaining leads in Velen and find the Baron's wife". Well, Velen is pretty big, and I don't know where to start. I did try to find more clues at the place where she was attacked and abducted, but there doesn't seem to be anything more there.
Where can I find the next clue about what happened there?
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How do you find Anna in The Witcher?
During the fight, the Botchling might also summon Wraiths you'll have to deal with. When it's down, Geralt will collect some blood to take back to the pelar. Talk to the pelar, and then follow the pelar to Wolven Grove where he'll start the ritual to find Anna and Tamara.How do you investigate all remaining leads in Velen and find the Barons wife?
How to 'investigate all remaining leads' in Family Matters. Later in the Family Matters quest, you'll come to a point where you must 'investigate all remaining leads'. To resolve this, you must complete the other main quest, Ladies of the Wood, to help continue things along.Witcher 3 Family Matters, How To Find The Barons Wife Anna
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