Ahhhh, OP, I've been there. I've so been there.
Before people start throwing rocks at the OP for 'thinking' she's more sophisticated than the other lady...
A local lady made friends with me when our DC were small (slightly different situation as the dc DID get on) and I ended up being her only English friend (we live in England, she is E. European). She IS absolutely lovely. I like her and admire her a lot.
I am v v English though, my home is my castle, I struggle with open house stuff and although I'm pretty outgoing I really began to struggle with the whole thing of always having to come in and chat for hours and being the conversation maker. I mean, I couldn't pick my DD up from their house without having a pint-sized glass of wine put in my hand, being given a pair of slippers and expected to make conversation for hours.
I am by FAR the least sophisticated of the two of us (I am not uneducated, professionally qualified to Masters Level etc etc but I am not sophisticated) she is professionally educated AND extremely creative/arty, I am not remotely interested in art, or creative things AT ALL.
Anyway, I'm just trying to say, OP, I've been there...the one that gets sats down expectantly to fill in all of the 'tumbleweed' moments. Actually I'd fricking love to be invited to Costa so I could up and LEAVE whenever I wanted instead of being made to feel guilty when I wanted to go home from their house.
Botttom line..I did what the suggestions on here say - I tried to expand the friendship with a friend who IS arty and into home decor etc etc..when I saw that that friendship was being rebuked I kind of absolved myself a bit.
Stay friendly, yes, but do NOT feel guilty ( I still do, I still feel guilty! But I have all kinds of stuff going on in my own life, not least of all crippling and entirely hidden depression and I cannot afford to make it my job to make people feel more relaxed in the UK, it is too much).