If she is a geologist then she should understand the VUL issues...

If she is a geologist then she should understand the VUL issues aren't just mini earthquakes - another reason there are protests against VUL is from a 2008 muckup around the risk of underground gypsum layer being drilled and then meeting water, expanding and cracking buildings above:

Geologists were consulted. You should clarify whether - and if so how - the mysterious cracks were caused by the holes. Scientists from TU Darmstadt have a theory. Ingo Sass, engineer geologist at TU Darmstadt and an expert in geothermal drilling, suspects in an interview with SPIEGEL ONLINE that the following has happened: "They started drilling at the town hall, pierced the gypsum-Keuper layer and hit the aquifer underneath Water is under high pressure. "

Keuper is an anhydrite, a calcium sulfate. If it comes into contact with water, gypsum is formed. And it expands. When the groundwater layer under the Keuper was drilled, the water shot up through the hole like a geyser and came into contact with the anhydrite. This started the chemical reaction. The underground rock can increase in volume by up to 60 percent during this process.

From: https://www-spiegel-de.translate.goog/wissenschaft/natur/nach-erdwaerme-bohrung-eine-stadt-zerreisst-a-589944.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB&_x_tr_pto=nui

Wish them well, but very happy to be long term into LKE..