Nothing in this chapter shall give the guardian of a person authority to:
(1) place that person in a State school or hospital except pursuant to 18 V.S.A. § 7601 et seq. or 18 V.S.A. § 8801 et seq.
(2) consent to an involuntary treatment or medication petition pursuant to 18 V.S.A. chapter 181.
(3) consent to sterilization or to a petition for involuntary sterilization pursuant to 18 V.S.A. chapter 204.
(4) consent to a petition for custody, care, or habilitation filed pursuant to 18 V.S.A. chapter 206.