Clara is just a temporary companion, so don't use permanent boost items on her.
Clara in this version of the game starts from level 6: which gives her an experience boost if our character is at a higher level. The advice is: to take advantage of the level advance to increase her ability to empty pockets and steal. You can concentrate with her on stealing items from the dishonest merchant (the one who resells the stolen items: to be clear): and continue to resell them to guarantee the party an infinite dose of money. With Her: as a result of this trick you can also legally buy all Athkatla items, as money will not be a problem. For being a temporary character she really has immense utility.
As a skill in general it is not bad: but not excellent either. With the short bow: she gets along well enough, but she doesn't excel at that either. Remember that her skill points: are the same as Hexxat when wearing the Cloak of Dragomir.
After exploring Dragomir's Tomb, she will die by the hand of Hexxat. It turns out that she forced Clara to awake her against her own will. Clara, despite insistence, is going to be killed.
When asked about her past, Hexxat is exceedingly vague. Of her past she says little, when she says anything at all. Her future plans are equally nebulous. It is possible that she once visited Dragomir's Tomb—if she didn't, she is certainly anxious to get there now.
Clara seems mentally unstable and can’t think rationally, to the extent that she’s not able to gather thoughts to maintain language basis or care for her own body health, as witnessed in her initial dialogue “I would... speak with you. I need help… I need help getting…” and her response when you offer her something to drink “No, I’m thirsty, but… no. I just want to go… to Dragomir’s Tomb. It’s where the graves are.”
Apparently Clara is very afraid to disappoint Hexxat.