See Ink of Noblest Metal (MuTe 20, Aq req) from Covenants p.97, which turns gold into a liquid. A variant would work with silver (that spell seems specifically designed for gold).
Melting lead requires a temperature of 327 C, while silver and gold require a temperature around 1000 C and iron around 1500 C. So I'd say melting gold or silver would require a Base 15 CrIg effect.
Rego Craft magic would be another option, using a variant of The Spell of Wrought Iron (ReTe 15) from Covenants p.51.
Yes, that is possible.
It is becoming increasingly difficult for us to check your math, because you haven't posted your maga's stats along with an advancement log by season. Please take the time to do so and update this topic!
Since her pater is a Jerbiton, he has certainly heard of the call for magi sent by Clusius. Joining a covenant that is right at the border of the Greater Alps would be sticking her finger into that Tribunal collective eye, so it would certainly appeal to her. So it would make sense that she exchanged letters with him during the previous season and got an invitation.
I don't understand what you mean by "collect specious"
Will her father join her at the new covenant?
What you describe for Oversensitive sounds more like a mix of Hatred and Weakness. We can work with that.
