1)A woman that accepted upon herself to daven (one, two or all the Tefilos), every day and did not stipulate that the acceptance was "bli neder- without the stringency of a vow" is obligated to always daven (those Tefilos that she accepted). If she wants to renege on this obligation, Hataras Nedarim (nullification of her vow) is required.
However, if a woman didn't accept upon herself to daven daily, and rather started davening with the intention that she would do so whenever she had the opportunity to do so, isn't obligated to daven on days that she is otherwise occupied etc. (even if she davened every day for weeks or months already, and once in a while a day comes along when she can't)
2) A woman who accepted upon herself to daven daily is subject to all the laws of Tefilah that apply to men. If she forgot something in Tefilah that requires the repeating the Tefilah for men (Mashiv HaRuach, Ya'aleh V'yavo etc.), it will require her to repeat as well. Similarly, if she forgot or was unable to daven one of the Tefilos, she is required to daven two Shemona Esreis at the next Tefilah.
A woman who usually davens Shacharis and Mincha, but not Maariv (as is the custom of many women), may still daven Maariv twice, if she forgot or was unable to daven Mincha. She may not, however, skip Maariv (as is her custom) and then daven twice at Shacharis, as the "make-up Tefilah" must be the Tefilah immediately subsequent to the Tefilah that was missed.(Rav Shlomo Zalmen Auerbach).
(Regarding a woman who always Davens Maariv, and forgets, there is a dispute in the Poskim if she may, must, or can't daven twice at Shacharis.)
A woman who doesn't usually daven, or only davens when she is able, does not repeat anything that she inadvertently forgot in davening and does not daven a "make-up" Tefilah ever.
Our holy sages, the Chazal tell us תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן עולם הבא, שנאמר הליכות עולם לו, אל תקרי הליכות אלא הלכות - one who studies [at least two] Halachos daily is assured a portion in Olam Haba-the world to come. (:מגילה כ"ח )
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Important Numbers
