I have mixed feelings about this. Should I be happy or concerned that they now have a way to find her?
For me, personally, I'd say concerned more than happy. For all the happiness that the two can give her, she has chosen to distance herself away. And them trying to find her, to the point of self-harm for Helianne, is a bit too far.
I feel that if they have any respect for her and her decisions, they should just leave her alone, give her money, send her letters, but not find and visit her. If they want space, give them space, and the option to choose you. The most they should do is just have open arms for when she decides she wants to come back.
A person deserves privacy when they want it, and any reasonable person can assume and deduce from the evidence they have gathered that Helga wanted to hide, and she planned this out. And I think, even if they want to meet her, they should let her enjoy her freedom as she wishes. It's just the right thing to do.
But y'know, this is a Manhwa, good things come with the prince's visit and she suddenly realized that she would've wanted her privacy utterly violated by her friends.
Or the author (hopefully) decides to be creative, and makes her legitimately angry, portray this as a breaking of trust, because any reasonable person wouldn't appreciate their old friends using witchcraft to find her address instead of being reasonable and waiting for her to tell them instead.