I like Sylvie, Marisol (nn Mari?), Pearl, Penelope, and Dorothy. Maybe you'd like Dorothea? then you have Thea as a nickname option. Dorothea Pearl nn Thea or Dora or Dottie or Dot, or Sylvia Pearl nn Sylvie. So much vintage!
For a less 'old' sounding name, I'd like Sylvie Elizabeth or Penelope Pearl for the cute alliterative option.
Daphne - Really like this one. It's a very light name, though, so a grounded middle like Elizabeth works well.
Silvia/Sylvie - Silvia is my favorite from your list; Sylvie is also lovely. I'd go with Silvia Pearl or Sylvie Elizabeth.
Marisol - Gorgeous! Marisol Elizabeth is a striking combo.
Pearl - Eh. Never really been into this one; the sound is kind of unattractive. Pearl Elizabeth works, though.
Penelope - Very cute, but growing in popularity. Penelope Elizabeth sounds great.
Dorothy and Tabitha - These have exactly the same slightly frumpy vibe to me; I don't quite like either. But Tabitha Pearl, Dorothy Pearl and Dorothy Elizabeth all flow really well.
Daphne, Silvia/Sylvie, Marisol, Pearl, Penelope, Dorothy and Tabitha
MN's will be Elizabeth and/or Pearl. Order doesnt matter.
Daphne Elizabeth Pearl - nice, but the E's bump.
*Daphne Pearl Elizabeth. Nice name!
Silvia Elizabeth Pearl - nice, but vowel bump. This spelling of Silvia will confuse people :/.
Silvia Pearl Elizabeth - nice name, I maintain the spelling concern.
Sylvie Elizabeth Pearl - nice, but vowel bump.
*Sylvie Pearl Elizabeth - one of my favorites!
Marisol Pearl Elizabeth - Marisol's a lovely name, but I feel like there's just a whole love of L back to back with these combos.
Marisol Elizabeth Pearl - same.
*Pearl Elizabeth - really like this!
Penelope Elizabeth Pearl - PEP are cute initials. The E's bump.
Penelope Pearl Elizabeth - cute, but PP is a bit unfortunate as initials. And I do think Penelope's going to become heavily tied to this point in time...
Dorothy Elizabeth Pearl - nice, the E's bump though.
*Dorothy Pearl Elizabeth - solid.
Tabitha Elizabeth Pearl - vowel bump and a lot of bith/beth right next to each other.
*Tabitha Pearl Elizabeth - really nice!
So, ones with stars above get my endorsement and my favorites are Sylvie Pearl Elizabeth and Pearl Elizabeth for what that's worth.