What did you mention as her intended date of arrival? Do they mention an average processing time on their website?
You can try to contact them, since it's been a month already, as long as you've been waiting longer than their processing time. Depending on the embassy/consulate: by e-mail, phone, messenger, line...
Adnan Khairi In the US it's normal, I have heard. Not in my home country, a EU member country. I have never been asked a single question by immigration officers. The most they have said is "welcome back!". What should they ask by the way? For example, why I am coming back to my home country? Does it make any sense? Or where I have been? What does it make for a difference?
Which channels of communication did you use? Do they have Messenger? Some embassies/consulates do not answer e-mails/phone calls, but they answer on Messenger.
Participant(e) anonyme YES IT COULD. Just contact your bank. There's no certainty, but it could well be the issue you are encountering. Give it a try, instead of waiting.
Participant(e) anonyme Again, call your bank. This is typical. There is no guarantee that it will solve your issue, but try at least. Again, I've had a similar issue when booking a flight. It never happened before and I regularly pay for all sorts of expenses in multiple countries. My personal banker first said "no, not possible, there's no block" and contacted me again half an hour later as she had identified the issue. There was some kind of block, that wasn't apparent first, but she lifted the block and for some reason insisted that I contact her once I am done, since she wanted to set it back up.
I've had it twice when filling out the forms. I cleared the cache of my browser and it helped (but it may have been just a coincidence, since the error page disappeared on subsequent occasions without me doing anything). I've had it again later when checking the status of my applications. In this case I did not clear the cache, just waited, and the error page disappeared.