a problem with 'parte' 'per' 'tra'
Mia sorella tra una settimana parte per un mese e deve avere il video in questi giorni!

is it that 'parte' here is a noun, means 'part'?
and what does this sentence mean?

Question

a problem with 'parte' 'per' 'tra'
Mia sorella tra una settimana parte per un mese e deve avere il video in questi giorni!

is it that 'parte' here is a noun, means 'part'?
  and what does this sentence mean?

Answer

no, parte is the third person singular of the verb partire= leave
in a week my sister leaves for a month and she must have the video these days!