Full translation of sencha/sad:

Grandfather, I...  Mariko had herself frozen.  She bought the
cryochamber pallet and lots of friends with the money you handed over
to her, Grandfather.  She jacked in, connected her own brain directly.
She exists only in the Sphere.  We've lost her, forever.

Sentence-by-sentence translation, with the first line in Japanese, the
second in transliterated Roman characters, and the third translated
into English:

おじいさま、私……。マリコは自分を凍らせたわ。
Ojiisama, watashi... Mariko wa jibun wo kooraseta wa.
Grandfather, I... Mariko had herself frozen.

彼女は、クライオチャンバーのパレットとたくさんの友達をおじいさまが
  渡したお金で買ったわ。
Kanojo wa, kuraiochanbaa no paretto to takusan no tomodachi wo ojiisama ga
  watashita okane de katta wa.
She bought the cryochamber pallet and lots of friends with the money
  you handed over to her, Grandfather.

自分の脳へハードの線を接続したわ。
Jibun no nou e haado no sen wo setsuzoku shita wa.
She jacked in, connected her own brain directly.

彼女はスフィアにしか存在しない。
Kanojo wa Sufia ni shika sonzai shinai.
She exists only in the Sphere.

私たちは彼女を失ったわ、永遠に。
Watashitachi wa kanojo wo ushinatta wa, eien ni.
We've lost her, forever.