"New Hampshire Garcia-Shapiro" is the mother of Isabella from 1914 who first appeared in "Phineas and Ferb and the Temple of Juatchadoon". Isabella made a deal with Doofenshmirtz from 1914 in order to free her, but it turned out to be a trap.
New Hampshire married a man and had Isabella with him, and spend sometime with her before deciding to go find the fabled Temple of Juatchadoon. During this time, Doofenshmirtz from 1914 captured her and use her as bait to get Ohio and Rhode-Island Fletcher.
Once she and the rest were rescued by Baljeet from 1914, she presumably continued to live with her daughter.
She looks physically identical to Vivian Garcia-Shapiro, but she wears archaeologist clothing.
She and Isabella were pretty close, as Isabella went to the extreme of making a deal with Doofenshmirtz in order to free her.