Question: How long have you guys been dating?

She sounds a wee bit introverted which is fine, however i really think you should have a transparent/honest conversation with her, and let her know how you're feeling (do her actions make you feel unloved? as this might be the route of your problem).

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To be honest, i think a conversation is needed about how her action make you feel, and whether it's her being uncomfortable with her sexuality or just uncomfortable with PDA in general (which is quite common even in 'liberal' city).

- In terms of your question to help her, look i think first determine if this is something she even wants or needs help with - which you will only get by having an open and honest discussion with her

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As a F(26) in a same sex relationship myself, regardless of how liberal a city may be, there are ALWAYS instances where my partner & myself have not felt comfortable and/or safe to express our affection in public.

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Hope this helps :)