regular past tense, following the stem "e" - "a" rule (with the regular exception of masc. pers. plurals)
"Verbs with infinitives in -e change e to a in all forms except the masculine personal plural."
Swan, Oscar (2008-10-12). Polish Verbs Essentials of Grammar, Second Edition (Verbs and Essentials of Grammar Series) (Kindle Locations 1339-1340). McGraw-Hill Education. Kindle Edition.
"She has told me," is present participle, occasionally, in the past. It's imperfect. "Yesterday" doesn't belong. "She told me yesterday." This is past perfect.
Actually, "She told me yesterday" would be more natural English than "Yesterday she told me".