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I'm so sorry to hear that Blondie is having discomfort. It sounds like she really should be taken to your vet for evaluation. Swellings under the tongue can be several things, including abscesses, or sialoceles (saliva gland issues), or could be from penetration by a foreign object or even a sting from an insect or bite from another animal. There is nothing really that you can do at home, and it would be best for a professional to examine her and decided if it is something that needs immediate intervention.
You are very welcome.
I am curious to learn how Blondie is doing, please give me an update if/when it is convenient for you.
Also, would you please take a moment to rate my consult, I only receive credit for my advice once a rating of 3 stars is received.