I've searched the available DRC records and cannot find a single entry that suggests a link in this generation between the Pels and Schepmoes families, every entry for this woman (and her sister) is a spelling variant of Symons. By no means exhaustive evidence but i think good enough at this stage to remove the surname Schepmoes from both profiles and lock name fields to avoid it reattaching.
The earliest generation of NY Schepmoes family is using the patronym Jansz.
There is another Jannetje Symons in New Amsterdam who marries in 1659 but this cannot be "our" Jannetje.
1659 05 Dec; Jan Dupree, wid Margariet Orommete; Jannetje Symons, van Amsterdam[NA DRC]