Will my client benefit from having a conventional HMR session by phone for her issue with her mother’s condemnation of her being gay?

That is the case. It is not the whole story about the trauma that resulted. As you advised her, there are a number of other difficulties in other lifetimes that resonated with that dark time and stirred up additional negative karma from the past in prior eras, and that has piled on top and been a major influence in making this such a devastating event and its unfortunate aftermath with an extended period of suffering. What is being worked on in the deep subconscious is a major factor in the severity of the suffering she has endured, so the subconscious channeling and trauma resolution work is the most critical, but a session on the current life events described will be helpful as well, because they are often being recalled as they are linked now to all of the other stored negative karma. And that will help to lessen the negative thoughts that come up on a frequent basis and so will contribute positively to the healing journey.