Not really, both forms (transitive and intransitive) exist. So, while it sounds a bit weird, "My mother's loves to prepare" is technically acceptable.
No, the intransitive verb needs a prepositional phrase after it. "Prepare for something" or an infinitive "prepare to do something" In English, it would not end as this sentence does. You could say "My mother loves to be prepared." which is what we use when in French they use the reflexive form, but I don't think that is the correct translation for this sentence, is it?
P.S. Did the apostrophe s or 's slip in by accident, because that would be a possessive form and has no place in this English sentence?