Short response: If you are feeling guided to use the #2 symbol then you should trust your intuition and do so.
Longer response: Your client has mentioned this to you and so has obviously put out to the Universe that she wants to work on this issue. We ask, we receive. Ask for guidance from your guides in treating this client. If your intuition tells you to use a certain symbol, use it. Remember that Reiki heals for the greatest good. If assimilating what she has read and what she knows about God is for her greatest good, then Reiki will help her with this.