This doesn’t sit well with me, although I have never raised the issue with her. But my thinking is “either you are kosher or you are not”, but NOT sometimes “on” and sometimes “off”.
I have been told that when a Jew is asked if s/he is keeping a particular mitzvah that s/he is not doing, the answer should be “not yet” rather than “no” as part of acknowledging that everyone is on the path, but at different places. Maybe this is more of a Reform attitude than a Conservative or Orthodox one, I do not know.
Which is better, that one tries to keep a religious discipline, whatever one’s religion, but does so imperfectly, or that one never tries at all because one knows one will not be likely to do so perfectly?
Also, I note that you put “conservative” in quotations. In Judaism, Conservative is a branch of Judaism, like Reform or Orthodox is. So she would likely be a Jew who attends a Conservative temple rather than a Jew who is conservative in her views, if that makes sense. Conservative and Reform Jews often have a somewhat different relationship with the kashrut laws than Orthodox Jews do.
kosherfood.about.com/od/kosherfaq/f/jewskeepkosh.htm
jewfaq.org/kashrut.htm says
"About 25% to 30% of Jews in America keep kosher to one extent or another. This includes the vast majority of people who identify themselves as Orthodox, as well as many Conservative and Reconstructionist Jews and some Reform Jews.
However, the standards that are observed vary substantially from one person to another. According to the 1990 National Jewish Population Survey (NJPS), only about 17% of Jewish families eat kosher meat all the time. (see Table 28 in the survey, if you can find it – I can no longer locate it online). Others keep kosher more strictly some times than others.
The strictest people will eat only foods that have reliable Orthodox kosher certification, eating only glatt-kosher certified meats and specially certified dairy products. They will not eat cooked food in a restaurant unless the restaurant has reliable Orthodox certification, and they are unlikely to accept an invitation to dinner from anyone who is not known to share their high standards.
Others are more lenient. Some will “ingredients read,” accepting grocery store items that do not contain any identifiably non-kosher ingredients. Some will eat cooked food in a restaurant or a non-kosher home, as long as the meal is either vegetarian or uses only kosher meat and no dairy products. Some will eat non-kosher meat in restaurants, but only if the meat comes from a kosher animal and is not served with dairy products. Many of these more lenient people keep stricter standards in their homes than they do in restaurants or in other people’s homes.
As rabbi/humorist Jack Moline noted, “Everyone who keeps kosher will tell you that his version is the only correct version. Everyone else is either a fanatic or a heretic.” (Growing Up Jewish, 1987). There is a lot of truth in this humorous observation. I have no doubt that I will receive mail calling me a heretic for even acknowledging the existence of lower standards. "