The "lesbian community" will do nothing for her to convince her to have sex with other women. It will gross her out and scare her off most likely. For a woman who might find other women sexy and attractive, she needs to be very carefully seduced. Girls laughing, talking sexy, touching a bit and perhaps eventually managing a kiss. I think kissing the the single biggest factor in being attracted to another woman. Women love kissing and it's erotic. The grossest thing to me is some chick at a lifestyle event who just tries to finger me or become overly sexual without getting to know me. Keep in mind I'm bi and I LOVE sex with other girls.
Women need to appreciate other women in a romantic sense. Rote sexual contact with another woman is not very satisfying to me at all. It's just going through the motions. No matter how attracted I was to girls in the beginning, I had no desire to just jump in and start going down on another girl. It took lots of time and the encouragement of Steph to get me comfortable and not self-conscious about all of this. Kissing Steph the first time was probably the most nerve wracking thing I ever did sexually. I still had a very minimal oral sexual experience with my girlfriend Cher, and we actually slept together and experimented for several years as school girls.
I was always "wired" a bit different and I had an attraction to women and girls at a very early age. I was fortunate enough to find a few older girls and girls my age to slowly experiment with and eventually enjoy sex. I was VERY careful about showing any attraction to girls or even any other people from school knowing about my attraction. I did not pursue girls from my school at all. I was very fortunate as a younger girl because I had my friend Cher who I experienced years of sleeping with and I had my tennis instructor Steph (who also "groomed" me into becoming a "nymphet" for her, her husband and her boyfriends). She really taught me fantastic lessons about sex between girls and sex in general. She taught me how to successfully pursue sex, enjoy sex, manipulate guys, pleasure girls (in some ways) and to be able to relax being naked and sexually active in the company of other people (all older than me). It took time and it was a fascinating journey. I never regretted a minute of those days and I'm thankful I had those experiences.
The most important factor in sex with other girls has always been romantic attraction, physical attraction and COMFORT with the situation above all else. Some very TASTEFUL girl, girl porn or threesome FMF can be extremely beneficial in getting your reluctant wife over the hump. I can guarantee that it will take time though. Of course this is all in my humble opinion and you must factor in how I started out in my sex life and how I've behaved sexually over all of these years. I hope this helps.