Can I (Spanish citizen) fully sponsor a Schengen visa applied for through a Spanish consulate?

I (Spanish citizen) am currently living abroad with my girlfriend. We want to take a relatively long trip to Spain and, while possible, she would have some trouble collecting enough money to prove subsistence means for visa purposes for such a long trip. My plan was to act as a sponsor, hopefully avoiding the need to send money to her bank account (since that would mean wasting money on an international transfer).

That arises a seemingly simple question: Can I, as a Spanish citizen, declare that I will cover all her expenses while she stays in the country?

I assumed the answer would be yes, since I suppose sponsorship is a common thing. However, I still asked this question to my local consulate just in case, and that's where things got confusing. On the one hand, I got this reply from them (translated from Spanish):

[...] invitations by Spanish residents may not, in any case, replace the accreditation by the interested part of the fulfillment of the obligation of stating their own economic resources. Whoever invites a foreigner to Spain may take responsibility -if desired- for their accommodation, but never for the subsistence expenses their stay may imply.

On the other hand, I checked the document in the consulate's website detailing the required documentation for a tourist Schengen visa application. The section regarding economic means states the following:

Confirmation of employment (with salary information) or, failing that, any other accreditation of economic means and intention to return (for example, a bank account extract [...] or a proof of sponsorship).

So my question still remains unanswered. I don't really know how to proceed considering both answers come from the same, supposedly reliable, source (Spanish consulate). Which one should I trust?