As you see, I have incorporated the number '8' in this. Though behind the triangle.
To explain this, look to the comic. All the canon trolls have symbols based on astrology, and as such, all fan-trolls should have a symbol based on star formations.
I did that in this, based off of the constellation 'Lupus'
I did not have any prior knowledge of her personality, so, I used the triangle as a base, and put and '8' behind like you had requested, making it only loosely based upon the star, but still enough to make a decent symbol.
As for a name, I understand you have a first name picked already, so if I may suggest a last one-
worfel
lerows
polowf
All troll names have to be 6 letters each- first and last, no middle names.
Thank you for looking at this, deary, and expect some fanart of your sweetheart fantroll when you pick a symbol. <3