This is SIL, not me. Only thing that ever worked for me was acupuncture - no one suitable in SIL's area (middle of nowhere) so I don't know what to suggest.
Cervix is ripening, EDD was just yesterday but she's 40 and they won't let her go far overdue, sadly - booked in for induction Fri, which she really wants to avoid (not least because I had a traumatic one with DD1).
Anyone got anything I can offer her?