I see two possibilities.
First, the philosophical background comment concerns Harry's mom and Elaine's parents/parent. The pentacle doesn't make sense as representative of Harry's philosophy, as he didn't pick it; it was inherited. If anything, he based his philosophy on his understanding of what it represents. Does that make sense to anyone else? If it held any innate philosophical meaning, it would be based on the one who makes it. So, if Elaine's amulet is inherited, then I think it'd say more about her parents—maybe that they were allied, or familiar with, Margaret (for reference, I always call Harry's mom "Margaret" so I can keep references to her separate from Harry's daughter, Maggie). Couple the pentacle with her potential to be a Starborn, and I think it's a fair guess that her parents knew what Maggie was trying for, and did the same—either as allies, or rivals. It's no accident that both Harry and Elaine were orphaned, too; I think it's likely that they were both orphaned because of their births—essentially, because of who their parents were and what they were trying to do.
But Harry really learned his philosophy from Ebenezer; Elaine didn't have that kind of apprenticeship. She went from being abused by Justin to working for Summer, and I somehow doubt that the Fae taught her much like Eb taught Harry.
On the other hand, I can see it as Elaine emulating Harry, dating back to their time together with Justin. Elaine has modeled her life on the only purely positive thing in it (that's alive, anyway): Harry. Harry understood her—they were both orphans, both fostered by an abusive mentor, both orphaned again when that mentor tried to dominate them, both in dutch to the Fae (though Summer and Winter separately), and each other's first everything. Elaine, like Harry, didn't have much to latch on to for stability, so they latched on to each other. Hell, even after Elaine came back to this plane, the first thing she does (assuming she isn't Kumori) is set up shop as a wizard private detective, just like Harry.
Anyway, I think it's perfectly plausible to speculate that Elaine made her amulet based on Harry's when they were together, trying to mimic the one thing in her life that was stable, present, and happy.