Yes, I have a suggestion.
Call her up and give her an ultimatum. Tell her: Dear X, since you have not answered to my calls and emails I'm assuming that you are no longer interested of being part of the bridal party. If after X date yo haven't responded I have no choice but to replace you.
I had a similar situation to yours. I ended up practicaly hunting her down weeks before the wedding to get her to send her RSVP . She didn't answer my calls or emails either and I simply didn't have time for this crap. When I gave her an ultimatum, she finally called (3 weeks before the wedding) and told me that she was coming, with an uninvited guest and that she didn;t ahve money for x and y. I ended up fotting the bill for some of her expenses (which is fine as we are financially able to do so), but this ended up creating more problems that it was worth. I feel used now. I paid for part of her hotel bill and her transportation. Her date went to the hotel bar and drank his heart out, leaving us with the bill, as he didn't have any money either. Since they didn't have money to paricipate in other events, they skipped them and only participated in the ones that we were paying for, which is fine, but on those events the actually BAGGED the food to take back to the hotel. She didn't bother to show up to the rehearsal, but on time for the rehersal dinner.
Also, they didn't bother to bring a gift, or at the very least a card... or at the bare minumum... a thank you. At the end, they partied the entire weekend at our expense, with free food and drinks and we didn't even have a card to show for the "honor" of their presence.
It's not worth it. Boot her out.
Good luck
EDIT: My wedding was also a destination wedding. She also skipped the shower and the bachelorette party citing financial concerns, which is fine. I really didn;t want to be bridezilaish or demanding and try to accomodate her as much as I could. She ended up costing us $1000 on top of her BM gift, the rehearsal dinner ($80 per person) and the reception (at $300 per person!) between transportation, lodging and her date's charges to the room and his unpaid bar tab. She gave me nothing but embarrassment. She was obviouly jealous that I had such a magnificent, luxirious wedding. IMO, people that cannot afford being a BM and participate, simply should decline. If you are not good enough for her to pay for a dress and attend your shower, then she's not worth it as a BM. TRUST ME. I know this is hard, but I wish that I had the gall to boot her out when I could.. all the signs were there and I chose to be "polite" instead. Some people are jelouse that they cannot have a wedding like yours and will abuse your generosity. I would never regret being polite and generous, but I do regret being not having the spine to boorher out when all my senses were telling me to do it.