<human>: Condense the text into a few key points

Hello, /relationships, I [24] had no idea where to ask this and felt that since it had to do with my relationship (5 months total, 2 months official) with my girlfriend [23] (whom recently moved many states away from me) and her mother, I would ask here.  Simply put, her mother has been very kind to me. Paying for my ticket to visit my girlfriend and shacking me up in a hotel in California for a weekend, and also for a future weekend.  

Now, I am writing her a letter basically saying thank you for everything, accompanied by some small gifts I purchased.  

I want it to say:
I want you to know that I appreciate everything you've done for me. I know this may not be much, but please accept this as a token of my gratitude. I promise I will do everything I can to support Edith, and do all I can to can to make her happy, now and in the future.  God bless you all. 

Here's what I have so far:
Gracias por todo lo que has hecho, se lo agradesco mucho. Se que esto no es mucho, pero por favor acepte mi sincero agradecimiento. 

Thoughts? Suggestions?  Different wordings?  Wrong subreddit?
Thank you in advance!
<bot>: Writing a thank you letter to girlfriends mom, she doesn't know Spanish and I can't find a translator, and would greatly appreciate some help.